1stdibs.Com (DIBS) 10-K29 Feb 242023 FY Annual reportFinancial data

Company Profile

COVER

COVER - USD ($) $ in Millions	12 Months Ended
COVER - USD ($) $ in Millions	Dec. 31, 2023	Feb. 01, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	333-256188
Entity Registrant Name	1stdibs.com, Inc
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3389618
Entity Address, Address Line One	300 Park Avenue South, 10th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10010
City Area Code	212
Local Phone Number	627-3929
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	DIBS
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 90.1
Entity Common Stock, Shares Outstanding		39,745,811
Documents Incorporated by Reference	Portions of the registrant’s Proxy Statement related to its 2024 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated. Except as expressly incorporated by reference, the Registrant's Proxy Statement shall not be deemed to be part of this report. Such Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the Registrant’s fiscal year end December 31, 2023.
Entity Central Index Key	0001600641
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY

AUDIT INFORMATION

AUDIT INFORMATION	12 Months Ended
AUDIT INFORMATION	Dec. 31, 2023
Audit Information [Abstract]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	New York, New York

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 37,395	$ 153,209
Short-term investments	101,926	0
Restricted cash, current	0	1,500
Accounts receivable, net of allowance for doubtful accounts of $188 and $113 at December 31, 2023 and 2022, respectively	643	972
Prepaid expenses	3,032	3,506
Receivables from payment processors	2,670	2,476
Other current assets	2,214	800
Total current assets	147,880	162,463
Restricted cash, non-current	3,580	3,334
Property and equipment, net	3,384	3,685
Operating lease right-of-use assets	19,655	21,990
Goodwill	4,116	4,075
Other assets	2,200	249
Total assets	180,815	195,796
Current liabilities:
Accounts payable	3,580	2,905
Payables due to sellers	6,521	7,185
Accrued expenses	10,883	10,761
Operating lease liabilities, current	3,107	2,770
Other current liabilities	3,618	2,429
Total current liabilities	27,709	26,050
Operating lease liabilities, non-current	18,812	21,678
Other liabilities	6	46
Total liabilities	46,527	47,774
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $0.01 par value; 10,000,000 shares authorized as of December 31, 2023 and 2022; zero shares issued and outstanding as of December 31, 2023 and 2022	0	0
Common stock, $0.01 par value; 400,000,000 shares authorized as of December 31, 2023 and 2022; 40,738,619 and 39,260,193 shares issued as of December 31, 2023 and 2022, respectively; and 39,915,136 and 39,260,193 shares outstanding as of December 31, 2023 and 2022, respectively	407	393
Treasury stock, at cost; 823,483 and zero shares as of December 31, 2023 and December 31, 2022, respectively	3,496	0
Additional paid-in capital	451,282	439,005
Accumulated deficit	(313,719)	(291,020)
Accumulated other comprehensive loss	(186)	(356)
Total stockholders’ equity	134,288	148,022
Total liabilities and stockholders’ equity	$ 180,815	$ 195,796

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 188	$ 113
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, outstanding (in shares)	0	0
Preferred stock, issued (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	400,000,000	400,000,000
Common stock, issued (in shares)	40,738,619	39,260,193
Common stock, outstanding (in shares)	39,915,136	39,260,193
Treasury stock, common (in shares)	823,483	0

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Net revenue	$ 84,684	$ 96,849	$ 102,731
Cost of revenue	25,111	29,670	32,167
Gross profit	59,573	67,179	70,564
Operating expenses:
Sales and marketing	36,640	44,776	47,414
Technology development	21,644	24,437	19,110
General and administrative	28,587	27,594	21,293
Provision for transaction losses	3,729	5,933	5,191
Gain on sale of Design Manager	0	(9,684)	0
Total operating expenses	90,600	93,056	93,008
Loss from operations	(31,027)	(25,877)	(22,444)
Other income, net:
Interest income	6,639	1,606	146
Interest expense	0	(11)	(16)
Other, net	1,703	1,781	1,372
Total other income, net	8,342	3,376	1,502
Net loss before income taxes	(22,685)	(22,501)	(20,942)
Provision for income taxes	(14)	(37)	(21)
Net loss	(22,699)	(22,538)	(20,963)
Accretion of redeemable convertible preferred stock to redemption value	0	0	(7,061)
Net loss attributable to common stockholders, basic	(22,699)	(22,538)	(28,024)
Net loss attributable to common stockholders, diluted	$ (22,699)	$ (22,538)	$ (28,024)
Net loss per share attributable to common stockholders—basic (in usd per share)	$ (0.57)	$ (0.59)	$ (1.08)
Net loss per share attributable to common stockholders—diluted (in usd per share)	$ (0.57)	$ (0.59)	$ (1.08)
Weighted average common shares outstanding—basic (in shares)	39,724,697	38,479,437	26,059,744
Weighted average common shares outstanding—diluted (in shares)	39,724,697	38,479,437	26,059,744

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net loss	$ (22,699)	$ (22,538)	$ (20,963)
Other comprehensive income (loss):
Foreign currency translation adjustment, net of tax of $0 for the years ended December 31, 2023, 2022, and 2021	75	(127)	(27)
Unrealized gains on marketable securities, net of tax of $0 for the years ended December 31, 2023, 2022, and 2021	95	0	0
Comprehensive loss	$ (22,529)	$ (22,665)	$ (20,990)

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, tax	$ 0	$ 0	$ 0
Unrealized (losses) gains on short-term investments, tax	$ 0	$ 0	$ 0

CONSOLIDATED STATEMENTS OF REDE

CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid - In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2020	19,243,795
Beginning Balance at Dec. 31, 2020	$ 298,525
Redeemable Convertible Preferred Stock
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)	(19,243,795)
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering	$ (305,586)
Accretion of redeemable convertible preferred stock to redemption value	$ 7,061
Ending balance (in shares) at Dec. 31, 2021	0
Ending Balance at Dec. 31, 2021	$ 0
Beginning balance (in shares) at Dec. 31, 2020		11,376,048
Beginning balance at Dec. 31, 2020	(243,946)	$ 114	$ 0	$ (243,858)	$ (202)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)		19,243,795
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering	305,586	$ 192	305,394
Issuance of common stock in connection with initial public offering, net of issuance costs of $14,762 (in shares)		6,612,500
Issuance of common stock in connection with initial public offering, net of issuance costs of $14,762	117,488	$ 66	117,422
Accretion of redeemable convertible preferred stock to redemption value	(7,061)		(3,400)	(3,661)
Issuance of common stock for acquisition of Design Manager (in shares)		45,152
Issuance of common stock for acquisition of Design Manager	767	$ 1	766
Issuance of common stock for exercise of stock options (in shares)		677,569
Issuance of common stock for exercise of stock options	2,729	$ 7	2,722
Issuance of common stock for cashless exercise of warrants (in shares)		35,665
Vested restricted stock units converted to common shares (in shares)		800
Stock-based compensation	2,865		2,865
Foreign currency translation adjustment	(27)				(27)
Net loss	(20,963)			(20,963)
Ending balance (in shares) at Dec. 31, 2021		37,991,529
Ending balance at Dec. 31, 2021	157,438	$ 380	425,769	(268,482)	(229)
Ending balance at Dec. 31, 2021						$ 0
Redeemable Convertible Preferred Stock
Accretion of redeemable convertible preferred stock to redemption value	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for exercise of stock options (in shares)		509,694
Issuance of common stock for exercise of stock options	2,035	$ 5	2,030
Vested restricted stock units converted to common shares (in shares)		758,970
Vested restricted stock units converted to common shares, net of shares net settled for taxes	0	$ 8	(8)
Stock-based compensation	11,214		11,214
Foreign currency translation adjustment	(127)				(127)
Net loss	$ (22,538)			(22,538)
Ending balance (in shares) at Dec. 31, 2022	39,260,193	39,260,193
Ending balance at Dec. 31, 2022	$ 148,022	$ 393	439,005	(291,020)	(356)
Ending balance at Dec. 31, 2022	0					0
Redeemable Convertible Preferred Stock
Accretion of redeemable convertible preferred stock to redemption value	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for exercise of stock options (in shares)	89,251	89,251
Issuance of common stock for exercise of stock options	$ 353	$ 1	352
Vested restricted stock units converted to common shares (in shares)		1,389,175
Vested restricted stock units converted to common shares, net of shares net settled for taxes	(608)	$ 13	(621)
Stock-based compensation	12,546		12,546
Repurchase of common stock (in shares)		(823,483)
Repurchase of common stock	(3,496)					(3,496)
Foreign currency translation adjustment	75
Other comprehensive income	170				170
Net loss	$ (22,699)			(22,699)
Ending balance (in shares) at Dec. 31, 2023	39,915,136	39,915,136
Ending balance at Dec. 31, 2023	$ 134,288	$ 407	$ 451,282	$ (313,719)	$ (186)
Ending balance at Dec. 31, 2023	$ (3,496)					$ (3,496)

CONSOLIDATED STATEMENTS OF RE_2

CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Statement of Stockholders' Equity [Abstract]
Issuance costs	$ 14,762

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (22,699)	$ (22,538)	$ (20,963)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,278	2,710	3,112
Stock-based compensation expense	12,363	11,214	2,839
Change in fair value of deferred acquisition consideration	0	0	427
Provision for transaction losses, returns and refunds	875	781	701
Amortization of costs to obtain revenue contracts	326	310	447
Amortization of operating lease right-of-use assets	2,596	2,541	0
Deferred rent	0	0	(194)
Gain on sale of Design Manager	0	(9,684)	0
Accretion of discounts and amortization of premiums on marketable securities, net	(3,390)	0	0
Other, net	(318)	195	21
Changes in operating assets and liabilities:
Accounts receivable	59	(497)	52
Prepaid expenses and other current assets	(1,469)	31	(1,418)
Receivables from payment processors	(194)	(323)	910
Other assets	(2,136)	(615)	(145)
Accounts payable and accrued expenses	578	(5,206)	5,055
Payables due to sellers	(662)	(3,041)	5,732
Operating lease liabilities	(2,790)	(2,735)	0
Other current liabilities and other liabilities	1,027	(1,057)	(977)
Net cash used in operating activities	(13,556)	(27,914)	(4,401)
Cash flows from investing activities:
Purchase of short-term investments	(191,093)	0	0
Maturities of short-term investments	92,653	0	0
Development of internal-use software	(1,706)	(1,871)	(2,110)
Purchases of property and equipment	(88)	(93)	(129)
Proceeds from sale of Design Manager	0	14,611	0
Other, net	2	(6)	(30)
Net cash (used in) provided by investing activities	(100,232)	12,641	(2,269)
Cash flows from financing activities:
Proceeds from issuance of common stock in initial public offering, net of underwriting discounts and commissions	0	0	122,993
Proceeds from exercise of stock options	353	2,035	2,729
Payments for repurchase of common stock	(3,374)	0	0
Payments for taxes related to net share settlement of stock-based compensation awards	(608)	0	0
Payment of deferred acquisition consideration	0	0	(640)
Payment of deferred offering costs	0	0	(5,032)
Net cash (used in) provided by financing activities	(3,629)	2,035	120,050
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	349	(278)	(16)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(117,068)	(13,516)	113,364
Cash, cash equivalents, and restricted cash at beginning of the period	158,043	171,559	58,195
Cash, cash equivalents, and restricted cash at end of the period	40,975	158,043	171,559
Supplemental disclosure of cash flow information:
Cash paid for income taxes	18	26	69
Cash paid for interest	0	10	16
Supplemental disclosure of non-cash activities:
Accretion of redeemable convertible preferred stock to redemption value	0	0	7,061
Conversion of redeemable convertible preferred stock in connection with initial public offering	0	0	305,586
Change in deferred offering costs included in accounts payable and accrued expenses	0	0	(872)
Issuance of common stock for Design Manager acquisition	$ 0	$ 0	$ 767

Nature of Business and Basis of

Nature of Business and Basis of Presentation	12 Months Ended
Nature of Business and Basis of Presentation	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business and Basis of Presentation	Nature of the Business and Basis of Presentation Nature of the Business 1stdibs.com, Inc. (“1stDibs” or the “Company”) is one of the world’s leading online marketplaces for connecting design lovers with many of the best sellers and makers of vintage & antique furniture, contemporary furniture, home décor, jewelry, watches, art, and fashion. The Company’s thoroughly vetted seller base, in-depth marketing content, and custom-built technology platform create trust in the Company’s brand and facilitate high-consideration purchases of luxury design products online. By disrupting the way these items are bought and sold, 1stDibs is both expanding access to, and growing the market for, luxury design products. The Company was incorporated in the state of Delaware on March 10, 2000 and is headquartered in New York, NY. Basis of Presentation The accompanying consolidated financial statements are prepared in accordance with the accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of the Company and its wholly-owned subsidiaries, 1stdibs.com, Ltd. and 1stdibs Design Manager, Inc. (“Design Manager”). The Company sold its equity interest in Design Manager on June 29, 2022, therefore, the consolidated statements of operations for the year ended December 31, 2022 include activity relating to Design Manager through the sale date. The consolidated balance sheets as of December 31, 2023 and 2022 no longer includes the assets, liabilities, and equity amounts associated with Design Manager. See Note 3 “Acquisitions & Disposals” for further details. All intercompany accounts and transactions have been eliminated in consolidation. Certain immaterial amounts in the financial statements of the prior years have been reclassified to conform to the current year presentation for comparative purposes.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Initial Public Offering The Company’s registration statement on Form S-1 (“IPO Registration Statement”) related to its initial public offering (“IPO”) was declared effective by the SEC on June 9, 2021, and the Company’s common stock began trading on the Nasdaq Global Select Market on June 10, 2021. On June 14, 2021, the Company completed its initial public offering of 6,612,500 shares of its common stock at a price to the public of $20.00 per share, which includes the exercise in full by the underwriters of their option to purchase from the Company an additional 862,500 shares of the Company’s common stock. The Company received net proceeds of $123.0 million after deducting underwriters’ discounts and commissions, before deducting offering costs. Upon the closing of the IPO, all shares of the Company’s outstanding redeemable convertible preferred stock automatically converted into 19,243,795 shares of common stock. Prior to the IPO, deferred offering costs, which consisted of direct incremental legal, accounting, and other third-party fees relating to the IPO, were capitalized in other current assets in the consolidated balance sheets. Upon completion of the IPO, the $5.5 million of deferred offering costs were reclassified into additional paid-in capital and accounted for as a reduction of the IPO proceeds in the consolidated balance sheets. Stock Split On May 25, 2021, the Company’s Board of Directors approved an amended and restated certificate of incorporation of the Company effecting a 1-for-3 reverse stock split of the Company’s issued and outstanding shares of redeemable convertible preferred stock and common stock. This was approved by the stockholders on May 28, 2021, and the split was effected on May 28, 2021 without any change in the par value per share. All information related to the Company’s redeemable convertible preferred stock, common stock, common stock warrants, and stock options, as well as the per share amounts, have been retroactively adjusted to give effect to the 1-for-3 reverse stock split for all periods presented. Use of Estimates The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions reflected in these consolidated financial statements include, but are not limited to, revenue recognition, provision for transaction losses, impairment assessment of goodwill, capitalization of internal-use software and determination of useful lives, income taxes, and the valuation of stock-based compensation and leases. The Company evaluates its estimates and assumptions on an ongoing basis. Actual results could differ from those estimates and such differences may be material to the consolidated financial statements. Foreign Currency and Currency Translation The Company has determined that the functional currency for its foreign operation is the currency of the primary cash flow of the operation, which is generally the local currency in which the operation is located. All assets and liabilities are generally translated into U.S. dollars using exchange rates in effect at the balance sheet date. Income and expenses are translated at the average exchange rate in effect during the period. Unrealized translation gains and losses are recorded as a translation adjustment, which is included in the consolidated statements of redeemable convertible preferred stock and stockholders’ equity (deficit) as a component of accumulated other comprehensive loss. Adjustments that arise from exchange rate changes on transactions denominated in a currency other than the local currency are included in foreign exchange gain (loss) in other, net in the consolidated statements of operations. Segment Information An operating segment is defined as a component of a business for which separate financial information is available that is evaluated regularly by the chief operating decision maker. The Company operates and manages its business as one reportable and operating segment. The Company’s chief executive officer, who is the chief operating decision maker, reviews financial information on a consolidated basis for purposes of evaluating financial performance and allocating resources. The Company’s single reportable and operating segment contains one reporting unit, which consists of the Company’s online marketplace that enables commerce between sellers and buyers. Business Combinations The Company accounts for business combinations using the acquisition method of accounting. The Company measures the tangible and intangible identifiable assets acquired, liabilities assumed, any non-controlling interest in the acquiree, and contingent consideration at fair value as of the acquisition date. Any excess purchase price over the fair value of net assets acquired is recorded as goodwill. Measurement period adjustments, if any, to the preliminary estimated fair value of the intangibles assets as of the acquisition date are recorded in goodwill. The results of businesses acquired in a business combination are included in the Company’s consolidated financial statements from the date of acquisition. Acquisition-related expenses represent expenses incurred by the Company to effect a business combination, including expenses such as finder’s fees and advisory, legal, accounting, valuation, and other professional or consulting fees, and are not included as a component of consideration transferred, but are accounted for as an expense in the period in which the costs are incurred or the services are rendered. Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents. Cash and cash equivalents are placed with large financial institutions that management believes are of high credit quality. At times, the Company’s cash balances with individual banking institutions are in excess of federally insured limits. The Company has not experienced any credit losses related to its cash and cash equivalents balance. As of December 31, 2023 and 2022, the Company had no single customer that represented more than 10% of its net revenue. Cash, Cash Equivalents, and Restricted Cash The following represents the Company’s cash, cash equivalents, and restricted cash as of the periods presented: December 31, (in thousands) 2023 2022 2021 Cash and cash equivalents $ 37,395 $ 153,209 $ 168,226 Restricted cash, current — 1,500 — Restricted cash, non-current 3,580 3,334 3,333 Total cash, cash equivalents and restricted cash $ 40,975 $ 158,043 $ 171,559 The Company considers all short-term, highly liquid investments purchased with an original maturity of three months or less at the date of purchase to be cash equivalents. Certain cash equivalents consist of investments in debt securities that are classified as available-for-sale. During the year ended December 31, 2023, the Company purchased $43.1 million of available-for-sale securities classified as cash equivalents. During the years ended December 31, 2022 and 2021, there were no purchases of available-for-sale securities. The Company’s restricted cash relates to a $3.3 million Letter of Credit for its office lease at 51 Astor Place, New York, NY, and a $0.2 million Letter of Credit for its office lease at 300 Park Avenue South, New York, NY. Additionally, $1.5 million was held in a joint escrow account in connection with the sale of Design Manager during the year ended December 31, 2022. During the year ended December 31, 2023 the restriction was lifted and the funds were released. The carrying value of the restricted cash approximates fair value. Short-term Investments Short-term investments designated as available-for-sale securities are carried at fair value, which is based on quoted market prices for such securities, if available, or is estimated on the basis of quoted market prices of financial instruments with similar characteristics. Investments with original maturities greater than 90 days and less than one year are classified within short-term investments on the Company’s consolidated balance sheets. In addition, investments with maturities beyond one year at the time of purchase that are highly liquid in nature and represent the investment of cash that is available for current operations are classified as short-term investments. Any other investments with original maturities greater than one year would be classified within long-term investments. Additionally, the Company records accrued interest receivable within other current assets on its consolidated balance sheets. Accrued interest receivable was $0.5 million as of December 31, 2023 and there was no accrued interest receivable as of December 31, 2022. Unrealized gains and losses of available-for-sale securities are excluded from earnings and are reported as a component of other comprehensive income (loss) until the security is sold, has matured, or the Company determines that the fair value of the security has declined below its adjusted cost basis and the decline is not due to a credit loss. Realized gains and losses on short-term investments are calculated based on the specific identification method and are reclassified from accumulated other comprehensive loss to other, net in the Company’s consolidated statements of operations. Short-term investments are evaluated for impairment quarterly. The Company’s portfolio of available-for-sale debt securities is required to incorporate forward-looking information to determine any credit losses. This risk is mitigated by the high quality nature of the investments. The Company evaluates the current expected credit loss by considering various factors in determining whether it should recognize an impairment charge, including the credit quality of the issuer, the duration that the fair value has been less than the adjusted cost basis, the severity and reason for the decline in value, and the Company’s intent to sell and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value. If the Company concluded that an investment is impaired or a portion of the unrealized loss is a result of a credit loss, it recognizes the charge at that time in the consolidated statements of operations. Determining whether the decline in fair value is due to a credit loss requires management judgment based on the specific facts and circumstances of each security. The ultimate value realized on these securities is subject to market price volatility until they are sold. The Company did not recognize any credit losses related to available-for-sale debt securities during the year ended December 31, 2023. Accounts Receivable, net The Company’s accounts receivable are recorded at amounts billed to sellers, generally for non-transactional revenue, which includes subscription, listing fees and advertising revenue, and are presented net of an estimated allowance for doubtful accounts on the Company’s consolidated balance sheets. The Company’s accounts receivable do not bear interest and do not require collateral or other security to support related receivables. The allowance for doubtful accounts considers forward-looking information to estimate expected credit losses using a number of factors, including age of the receivable, current economic conditions, historical losses, and management’s assessment and judgment of the sellers. The evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. Losses are charged against the allowance when management believes the un-collectability of a receivable is confirmed and subsequent recoveries, if any, are credited to the allowance. Account balances are written off after all means of collection are exhausted and the potential for non-recovery is determined to be probable. Adjustments to the allowance for doubtful accounts are recorded as a component of provision for transaction losses in the consolidated statements of operations. Receivables from Payment Processors and Payables Due to Sellers Receivables from payment processors represent amounts received from buyers via third-party payment processors which will be deposited by the payment processors to 1stDibs’ bank accounts for payment to sellers and shipping carriers. The Company also collects sales tax from buyers on behalf of sellers in certain jurisdictions as a marketplace facilitator and remits these collected taxes directly to the tax authorities. The portion of the cash and related receivable remaining after deducting the Company’s commission and processing fees represents the total payables due to third parties, which consists of payables due to sellers, payables due to shipping carriers in instances where 1stDibs’ shipping services are elected by sellers, and payables due to tax authorities. The Company establishes an allowance for seller refunds for amounts that sellers owe the Company after a return is processed. The allowance for seller refunds was $0.2 million and $0.3 million at December 31, 2023 and 2022, respectively and included in other current assets on the Company’s consolidated balance sheets. Property and Equipment, net Property and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives. The Company capitalizes costs related to internal-use software during the application development stage, including consulting costs and compensation expenses related to employees who devote time to the development projects. The Company records software development costs in property and equipment, net. Costs incurred in the preliminary stages of development activities and post implementation activities are expensed in the period incurred and are included in technology development in the consolidated statements of operations. The Company also capitalizes costs related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Once the project is available for general release, capitalization ceases, and asset amortization begins. Capitalized costs associated with internal-use software are amortized on a straight-line basis over their estimated useful life, which is generally three years, and are included in cost of revenue in the consolidated statements of operations. The general range of useful lives of property and equipment is as follows: Estimated Useful Life Leasehold improvements Lesser of lease term or life of asset Furniture and fixtures 3 years Computer equipment and software 3 years Internal-use software Lesser of contract term or 3 years When assets are sold or retired, the cost and related accumulated depreciation or amortization of assets disposed of are removed from the accounts, with any resulting gain or loss recorded in income from operations in the consolidated statements of operations and consolidated statements of comprehensive loss. Costs of repairs and maintenance are expensed as incurred. When events occur or changes in circumstances require, the Company assesses the likelihood of recovering the cost of long-lived assets based on its expectations of future profitability, undiscounted cash flows, and management’s plans with respect to operations to determine if the asset is impaired and subject to write-off. Measurement of any impairment loss is based on the excess of the carrying value of the asset over the fair value. For the years ended December 31, 2023, 2022 and 2021, there were no impairment losses recorded. Goodwill Goodwill represents the excess of cost over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. Goodwill is not amortized but is tested for impairment annually or more frequently if events or changes in circumstances indicate that the asset may be impaired. The Company’s goodwill is evaluated at the entity level as it is determined there is one reporting unit, 1stDibs. The Company performs its annual goodwill impairment test as of October 1st or more frequently if events or changes in circumstances indicate that the goodwill may be impaired. The Company has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines it is not more likely than not that the fair value of the reporting unit is less than its carrying amount, then additional impairment testing is not required. However, if the Company concludes otherwise, then it is required to perform a quantitative assessment for impairment. The quantitative assessment involves comparing the estimated fair value of the reporting unit with its respective book value, including goodwill. If the estimated fair value exceeds book value, goodwill is not impaired. If the book value of the reporting unit exceeds the fair value, an impairment loss is recognized in an amount equal to the excess, not to exceed the total amount of goodwill allocated to the reporting unit. Based on the Company’s assessments, there were no impairment losses recorded during the years ended December 31, 2023, 2022 and 2021. Leases Effective January 1, 2022, the Company adopted ASU 2016-02, utilizing the modified retrospective adoption approach. The Company enters into contracts in the normal course of business and assesses whether any such contracts contain a lease. The Company determines if an arrangement is a lease at inception if it conveys the right to control the identified asset for a period of time in exchange for consideration. The Company classifies leases as operating or financing in nature, and records the associated right-of-use asset and lease liability on its consolidated balance sheet. The lease liability represents the present value of future lease payments, net of lease incentives, discounted using an incremental borrowing rate, which is a management estimate based on the information available at the commencement date of a lease arrangement. Lease expense is recognized as a single lease cost on a straight-line basis over the lease term. The lease term consists of non-cancelable periods and may include options, including those to extend or terminate, if it is reasonably certain they will be exercised. The Company accounts for lease and non-lease components related to operating leases as a single lease component. The Company has elected that costs associated with leases having an initial term of 12 months or less ("short-term leases") are recognized in the consolidated statement of operations on a straight-line basis over the lease term and are not recorded on the balance sheet. Variable lease expense is recognized as incurred and consists primarily of real estate taxes, utilities, and other office space related expenses. Prior to adoption, during the fiscal years ended December 31, 2021 and prior, the Company accounted for leases under ASC 840, whereby rent expense associated with operating leases was recognized on a straight-line basis over the lease term. Contingencies The Company has certain contingent liabilities that arise in the ordinary course of business activities. The Company accrues for loss contingencies when losses become probable and are reasonably estimable. If the reasonable estimate of the loss is a range and no amount within the range is a better estimate, the minimum amount of the range is recorded as a liability on the Company’s consolidated balance sheets. The Company does not accrue for contingent losses that, in its judgment, are considered to be reasonably possible, but not probable. Fair Value of Financial Instruments Certain assets and liabilities are carried at fair value in accordance with GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value require the Company to maximize the use of observable inputs and minimize the use of unobservable inputs. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies, and similar techniques. Short-term investments and certain cash equivalents consist of investments in debt securities that are available-for-sale. The table below segregates all assets that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date: December 31, 2023 (in thousands) Level 1 Level 2 Level 3 Total Cash equivalents: Money market fund $ 5,797 $ — $ — $ 5,797 U.S. Treasury securities — 4,991 — 4,991 Total cash equivalents $ 5,797 $ 4,991 $ — $ 10,788 Short-term investments: Commercial paper $ — $ 18,112 $ — $ 18,112 Corporate notes — 7,641 — 7,641 U.S. Treasury securities — 11,971 — 11,971 U.S. Government agency securities — 64,202 — 64,202 Total short-term investments $ — $ 101,926 $ — $ 101,926 There were no transfers between Level 1, Level 2 or Level 3 during the years ended December 31, 2023 and 2022. As of December 31, 2023, all other financial instruments not included in the table above were classified as Level 1. As of December 31, 2022, the carrying amounts of the Company’s financial instruments, including cash and cash equivalents, restricted cash, accounts receivable, net, prepaid expenses, receivables from payment processors, other current assets, accounts payable, payables due to sellers, accrued expenses and other current liabilities, approximate fair value due to the short-term nature of these assets and liabilities, and therefore were all classified as Level 1. The Company’s cash equivalents and short-term investments for the periods presented were valued using quoted market prices or alternative pricing sources and models utilizing observable market inputs and were classified as Level 1 or Level 2, accordingly. Income Taxes Income taxes are computed using the asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the Company’s consolidated financial statements. In estimating future tax consequences, the Company considers all expected future events other than enactment of changes in tax laws or rates. A valuation allowance is recorded, if necessary, to reduce net deferred tax assets to their realizable values if management does not believe it is more likely than not that the net deferred tax assets will be realized. The Company follows the provisions of the authoritative guidance from the Financial Accounting Standards Board (“FASB”) on accounting for uncertainty in income taxes. These provisions provide a comprehensive model for the recognition, measurement, and disclosure in the financial statements of uncertain income tax positions that a company has taken or expects to take on a tax return. Under these provisions, a company can recognize the benefit of an income tax position only if it is more likely than not (greater than 50%) that the tax position will be sustained upon tax examination, based solely on the technical merits of the tax position. Otherwise, no benefit can be recognized. Assessing an uncertain tax position begins with the initial determination of the sustainability of the position and is measured at the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. As of each balance sheet date, unresolved uncertain tax positions must be reassessed. Additionally, the Company must accrue interest and related penalties, if applicable, on all tax exposures for which reserves have been established consistent with jurisdictional tax laws. The Company’s policy is to recognize interest and penalties related to uncertain tax positions in the provision for income taxes. As of December 31, 2023 and 2022, the Company had no accrued interest or penalties related to uncertain tax positions. The Company assesses foreign investment levels periodically to determine if all or a portion of the Company’s investments in its foreign subsidiary are indefinitely invested. Any required adjustment to the income tax provision (benefit) would be reflected in the period that the Company changes this assessment. The Company recognizes the tax on global intangible low-taxed income (“GILTI”) earned by foreign subsidiaries as a period expense in the period the tax is incurred. Net Loss per Share Attributable to Common Stockholders The Company applies the two-class method to compute basic and diluted net loss per share when shares meet the definition of participating securities. The two-class method determines net loss per share for each class of common and participating securities according to dividends declared or accumulated and participation rights in undistributed earnings. The two- class method requires income available to common stockholders for the period to be allocated between common and participating securities based upon their respective rights to receive dividends as if all income for the period has been distributed. During periods of loss, there is no allocation required under the two-class method. Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted average number of common shares outstanding for the period without consideration of potentially dilutive common stock. Diluted earnings per share attributable to common stockholders is computed by dividing the diluted earnings attributable to common stockholders by the weighted average number of common shares outstanding for the period, including potential dilutive common shares. For periods in which the Company reports net losses, diluted net loss per common share attributable to common stockholders is the same as basic net loss per common share attributable to common stockholders because potentially dilutive shares of common stock are not assumed to have been issued since their effect is anti-dilutive. Treasury Stock In August 2023, the Company’s Board of Directors authorized the Company to repurchase up to an aggregate of $20.0 million of the Company's common stock (“Stock Repurchase Program”) traded on public markets. The repurchased common stock is classified as treasury stock on the consolidated balance sheets. The direct costs incurred to acquire treasury stock are treated like stock issue costs and added to the cost of the treasury stock, which includes applicable fees and taxes. Repurchased common stock is stated at cost, determined on an average cost basis and is presented as a reduction of stockholders’ equity on the consolidated balance sheets. Revenue Recognition The Company’s net revenue consists principally of seller marketplace services, advertisements, and prior to the sale of Design Manager, software services. Seller marketplace services primarily consist of marketplace transactions, subscriptions, and listing fees. Revenue is recognized as the Company transfers control of promised goods or services to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The Company evaluates whether it is appropriate to recognize revenue on a gross or net basis based upon its evaluation of whether the Company obtains control of the specified goods or services by considering if it is primarily responsible for fulfillment of the promise, has inventory risk, has the latitude in establishing pricing and selecting suppliers, among other factors. The Company does not have any remaining performance obligations associated with contracts with terms greater than one year. Seller Marketplace Services (Marketplace Transactions, Subscriptions, and Listings) The Company charges sellers commission and processing fees for successful purchases through its online marketplace. For the items purchased through the 1stDibs online marketplace, the Company collects the gross merchandise value from the buyer, and recognizes the associated revenue on a net basis, which equates to the commission and processing fees earned in exchange for the seller marketplace services. The commission fees range from 5% to 50% and processing fees are 3% of the buyer’s total payment, net of expected refunds. If a seller accepts a return or refund of an on-platform purchase, the related commission and processing fees are refunded to the seller. The Company records discounts provided to the end buyer, to whom the Company has no performance obligation, such as promotional discounts, in sales and marketing expense since the discounts are not related directly to the Company’s revenue source but rather used as a marketing tool, and the seller is not made aware of the discounts provided to the end buyer. The commission and processing fees are recognized net of estimated refunds when the corresponding transaction is confirmed by the buyer and seller. The Company does not take title to inventory sold or assume risk of loss at any point in time during the transaction and is authorized to collect consideration from the buyer and remit net consideration to the seller to facilitate the processing of the confirmed purchase transaction. We offer our sellers various subscription pricing tiers which allows them to choose the plan that best fits their business, with choices of a higher monthly subscription fee and lower commission rates or a lower monthly subscription fee and higher commission rates. Additionally, some sellers have no monthly subscription fees and higher commission rates, however, the Company no longer offers this option to new sellers. Sellers receive the benefit of marketplace activities, including listing items for sale, completing sales transactions, and payments processing, which represents a single stand-ready performance obligation. The Company has determined that its customers are sellers on its online marketplace since sellers pay for the use of the platform to sell their inventory. For sellers that pay a subscription, it is on an annual basis, payable monthly, therefore the fee is recognized monthly. If during the annual subscription period a seller ceases to make its monthly payment, the Company is no longer obligated to provide the subscribed services and the seller can be terminated at the Company’s sole discretion. The Company earns listing fees from sellers on a per item basis as directed by the seller to promote certain items at the seller’s discretion. Listing fees are recognized ratably over time when the listing is publicly posted. Advertisements Advertising revenue is generated by displaying seller ads on the 1stDibs online marketplace. For advertising services, the Company enters into agreements with advertisers, or sellers, in the form of signed insertion orders, which specify the terms of services and fees, prior to advertising campaigns being run. The Company recognizes revenue

Acquisitions & Disposals

Acquisitions & Disposals	12 Months Ended
Acquisitions & Disposals	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions and Disposals	Acquisitions & Disposals Design Manager On May 2, 2019, the Company acquired 100% of the outstanding equity of Franklin Potter Associates, Inc. and its subsidiary, doing business as Design Manager, for a total purchase consideration of $4.2 million. As a result, Design Manager became a wholly-owned subsidiary of the Company. On June 29, 2022, the Company sold 100% of its equity interest in Design Manager for a purchase price of $14.8 million. The Company received net cash proceeds of $14.6 million, of which $1.5 million was held in a joint escrow account for 12 months from the date of the sale and was recorded as restricted cash, current in the Company’s 2022 consolidated balance sheet. Additionally, a net gain on the sale of $9.7 million was recognized during the year ended December 31, 2022, and is included in loss from operations on the consolidated statement of operations.

Revenue Recognition

Revenue Recognition	12 Months Ended
Revenue Recognition	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The following table summarizes the Company’s net revenue by type of service for the periods presented: Year Ended December 31, (in thousands) 2023 2022 2021 Seller marketplace services $ 83,925 $ 94,333 $ 98,984 Other services 759 2,516 3,747 Total net revenue $ 84,684 $ 96,849 $ 102,731 The Company generates revenue from seller marketplace services and other services. Seller marketplace services primarily consist of marketplace transaction, subscription, and listing fees. Other services primarily consist of advertising revenues generated from displaying ads on the Company’s online marketplace and software services revenue related to Design Manager, typically used by interior designers. Design Manager was sold on June 29, 2022; therefore, no related net revenue for software services was recognized after the sale date. Contract Balances from Contracts with Customers The following table provides a rollforward of the deferred revenue amounts as follows: (in thousands) Amount Balance as of December 31, 2021 $ 944 Billings 1,502 Revenue recognized (1,661) Reduction resulting from the sale of Design Manager (602) Balance as of December 31, 2022 $ 183 Billings 40 Net revenue recognized (160) Balance as of December 31, 2023 $ 63

Short-Term Investments

Short-Term Investments	12 Months Ended
Short-Term Investments	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Short-Term Investments	Short-Term Investments The following table summarizes the estimated value of the Company’s short-term investments as of December 31, 2023: December 31, 2023 (in thousands) Amortized Cost Unrealized Gain Unrealized Loss Fair Value Commercial paper $ 18,101 $ 14 $ (3) $ 18,112 Corporate notes 7,621 20 — 7,641 U.S. Treasury securities 11,975 2 (6) 11,971 U.S. Government agency securities 64,134 89 (21) 64,202 Total short-term investments $ 101,831 $ 125 $ (30) $ 101,926 As of December 31, 2022, the Company had no short-term investments. The Company does not intend to sell the investments and it is not more likely than not that the company will be required to sell these before recovery. As of December 31, 2023, the fair value of short-term investments by remaining contractual maturity consisted of the following: (in thousands) Fair Value Remaining maturity date one year or less $ 89,203 Remaining maturity date greater than one year 12,723 Total short-term investments $ 101,926

Accounts Receivable, net

Accounts Receivable, net	12 Months Ended
Accounts Receivable, net	Dec. 31, 2023
Receivables [Abstract]
Accounts Receivable, net	Accounts Receivable, net Accounts receivable, net was $0.6 million and $1.0 million at December 31, 2023 and 2022, respectively. The Company recorded an allowance for doubtful accounts of $0.2 million and $0.1 million as of December 31, 2023 and 2022, respectively. Changes in the allowance for doubtful accounts for the periods presented were as follows: (in thousands) Amount Balance as of January 1, 2022 $ 29 Provisions charged to operating results 206 Account write-offs (122) Balance as of December 31, 2022 $ 113 Provisions charged to operating results 256 Account write-offs (181) Balance as of December 31, 2023 $ 188

Property and Equipment, net

Property and Equipment, net	12 Months Ended
Property and Equipment, net	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property and Equipment, net	Property and Equipment, net As of December 31, 2023 and 2022, property and equipment, net consisted of the following: December 31, (in thousands) 2023 2022 Internal-use software $ 19,541 $ 18,418 Leasehold improvements 3,605 3,594 Furniture and fixtures 1,131 1,114 Computer equipment and software 919 851 Software in progress 569 562 Total property and equipment, gross $ 25,765 $ 24,539 Less: accumulated depreciation and amortization (22,381) (20,854) Total property and equipment, net $ 3,384 $ 3,685 As of December 31, 2023 and 2022, the net book value of internal-use software was $2.7 million and $3.0 million, respectively. Depreciation and amortization expense related to the Company’s property and equipment totaled $2.3 million, $2.6 million, and $2.9 million, for the years ended December 31, 2023, 2022, and 2021, respectively, which included amortization expense for internal-use software of $2.2 million, $2.5 million, and $2.8 million, respectively.

Goodwill

Goodwill	12 Months Ended
Goodwill	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill The changes in the carrying balance of goodwill for the periods presented were as follows (in thousands): (in thousands) Amount Balance as of January 1, 2022 $ 7,202 Reduction resulting from the sale of Design Manager (3,036) Foreign currency translation adjustment (91) Balance as of December 31, 2022 $ 4,075 Foreign currency translation adjustment 41 Balance as of December 31, 2023 $ 4,116

Accrued Expenses

Accrued Expenses	12 Months Ended
Accrued Expenses	Dec. 31, 2023
Payables and Accruals [Abstract]
Accrued Expenses	Accrued Expenses As of December 31, 2023 and 2022, accrued expenses consisted of the following: December 31, (in thousands) 2023 2022 Shipping $ 2,934 $ 3,597 Compensation & benefits 3,164 1,862 Sales & use taxes payable 1,534 1,378 Allowance for transaction losses 1,172 1,327 Payment processor fees 557 970 Allowance for e-commerce returns 401 438 Other 1,121 1,189 Total accrued expenses $ 10,883 $ 10,761

Leases

Leases	12 Months Ended
Leases	Dec. 31, 2023
Leases [Abstract]
Leases	Leases The Company’s operating lease arrangements are principally for office spaces in New York City. As of December 31, 2023, the Company had $19.7 million of operating lease right-of-use assets, $3.1 million and $18.8 million of current and non-current operating lease liabilities, respectively, and no finance leases on its consolidated balance sheet. These operating lease arrangements included in the measurement of lease liabilities had a weighted-average remaining lease term of 6.0 years, a weighted-average discount rate of 5.9%, and do not reflect options to extend or terminate, as management does not consider the exercise of these options to be reasonably certain. The Company paid $4.1 million and $4.2 million for amounts included in the measurement of lease liabilities during the years ended December 31, 2023 and 2022. In August 2023, the Company entered into a sublease agreement as the sublessor for its office space in its former New York City headquarters (the “Sublease”). The Sublease commenced on October 1, 2023 for approximately 78% of the rentable square feet and expanded to 100% of the rentable square feet on January 15, 2024. The sublease ends on December 31, 2029, the expiration date of the Company’s former New York City headquarter’s lease, and contains an option for the lessee to terminate on the third anniversary of the commencement date. The Sublease contains a five-month rent abatement provision, with an additional abatement against fixed rent for the sixth calendar month. Beginning in April 2024 the Company will collect monthly lease payments of $0.3 million with annual increases over the term. In addition, the subtenant will be responsible for its proportionate share of certain defined expenses, including increases in taxes after the base year, as well as certain electric, heating, ventilation, and air conditioning charges. The proportionate share will be 78% from the commencement of the Sublease until the January 15, 2024, at that time the proportionate share will be increased to 100%. Sublease income is recognized as an offset to lease expense on a straight-line basis over the lease term and is included in general and administrative expenses on the Company’s consolidated statement of operations. During the year ended December 31, 2023, the Company capitalized its $1.1 million broker fee paid which is included in other assets on the consolidated balance sheet, and will be amortized over the life of the Sublease in operating expenses in the consolidated statement of operations. The Company recognized $0.9 million of sublease income during the year ended December 31, 2023. There was no sublease income recognized in the years ended December 31, 2022, and 2021. In November 2023, the Company entered into a lease agreement, as the lessee, for approximately 13,000 square feet for a new office which is expected to be the Company’s new corporate headquarters in New York City (the “Lease Agreement”). The Lease Agreement is expected to have a commencement date during the first quarter of 2024 with a five year term and an initial seven month rent abatement period. The lease agreement includes an option for the Company to extend the lease for an additional five years. The following table summarizes total lease expense, net for the years ended December 31, 2023 and 2022: December 31, (in thousands) 2023 2022 Operating lease expense $ 3,970 $ 3,988 Short-term lease expense 120 111 Variable lease expense 1,124 1,058 Total lease expense $ 5,214 $ 5,157 Sublease income (912) — Total lease expense, net $ 4,302 $ 5,157 Operating lease expense is recognized on a straight-line basis over the term of the arrangement beginning on the lease commencement date for lease arrangements that have an initial term greater than 12 months and therefore are recorded on the balance sheet. Short-term lease expense is recognized on a straight-line basis over the lease term for lease arrangements that have an initial term of 12 months or less and therefore are not recorded on the balance sheet. Variable lease expense is recognized as incurred and consists primarily of real estate taxes, utilities, and other office space related expenses. As of December 31, 2023, the total remaining operating lease payments included in the measurement of lease liabilities, and undiscounted remaining cash receipts from the Company’s Sublease was as follows (in thousands): Fiscal Year Ending December 31, Operating Lease Payments Sublease Cash Receipts 2024 $ (4,255) $ 2,374 2025 (4,410) 3,435 2026 (4,292) 3,504 2027 (4,292) 3,574 2028 (4,292) 3,645 Thereafter (4,292) 3,718 Total (payments) cash receipts $ (25,833) $ 20,250 Less: imputed interest 3,914 Total lease liabilities $ (21,919)

Other Current Liabilities

Other Current Liabilities	12 Months Ended
Other Current Liabilities	Dec. 31, 2023
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	Other Current Liabilities As of December 31, 2023 and 2022, other current liabilities consisted of the following: December 31, (in thousands) 2023 2022 Sales and other non-income tax contingencies $ 2,462 $ 1,863 Buyer deposits 377 318 Other 779 $ 248 Total other current liabilities $ 3,618 $ 2,429

Equity

Equity	12 Months Ended
Equity	Dec. 31, 2023
Equity [Abstract]
Equity	Equity As of December 31, 2023 and 2022, the Company had reserved shares of common stock for issuance in connection with the following: December 31, 2023 2022 Options to purchase common stock 3,831,710 4,034,287 Restricted stock units outstanding 3,400,489 2,807,981 Shares available for future grant under the 2021 Plan 3,119,122 3,151,824 Shares available for future grant under the ESPP 1,572,504 1,179,902 Total 11,923,825 11,173,994 Preferred Stock Effective June 14, 2021, in connection with the closing of the Company’s IPO, the Company’s board of directors (“Board”) is authorized to issue up to 10,000,000 shares of preferred stock, $0.01 par value per share, in one or more series. The Company's Board has the discretion to determine the rights, preferences, privileges and restrictions, including voting rights, dividend rights, conversion rights, redemption privileges and liquidation preferences, of each series of preferred stock. As of December 31, 2023 and 2022, no shares of preferred stock were issued or outstanding. Common Stock As of December 31, 2023 and 2022, the Company had authorized 400,000,000 shares of voting common stock, $0.01 par value per share. Each holder of the Company's common stock is entitled to one vote for each share on all matters to be voted upon by the stockholders and there are no cumulative rights. Subject to any preferential rights of any outstanding preferred stock, holders of the Company's common stock are entitled to receive ratably the dividends, if any, as may be declared from time to time by the Board out of legally available funds. If there is a liquidation, dissolution, or winding up of the Company, holders of the Company's common stock would be entitled to share in the Company's assets remaining after the payment of liabilities and any preferential rights of any outstanding preferred stock. The rights, preferences, and privileges of the holders of the Company's common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of preferred stock which the Company may designate and issue in the future. Treasury Stock As of December 31, 2023, the Company had 823,483 shares of treasury stock carried at its cost basis of $3.5 million, which the Company purchased during the year ended December 31, 2023, and approximately $16.5 million remains available for future purchases. The repurchase may be affected, from time-to-time, through open market purchases, privately negotiated transactions, Rule 10b5-1 plans, accelerated stock repurchases, block trades, derivative contracts or otherwise in compliance with Rule 10b-18 of the Exchange Act. The repurchase program is not subject to a termination or expiration date, and it does not obligate the Company to acquire any specific number of shares. The timing, price and volume of repurchases will be based on a number of factors, including market conditions, relevant securities laws, and other considerations.

Stock-based Compensation

Stock-based Compensation	12 Months Ended
Stock-based Compensation	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based Compensation	Stock-based compensation 2011 Option Plan The Company adopted the 2011 Stock Option and Grant Plan (the “2011 Plan”) on September 2, 2011 and amended and restated the plan on December 14, 2011. The 2011 Plan provided for the Company to grant incentive stock options (“ISOs”), or nonqualified stock options, restricted stock awards, and other stock-based awards to its employees, directors, officers, outside advisors, and non-employee consultants. At the time of grant, the options issued to new employees pursuant to the 2011 Plan expire ten years from the date of grant and generally vest over four years, with 25% vesting on the first anniversary and the balance vesting ratably over the remaining 36 months. The 2011 Plan was administered by the Compensation Committee of the Board. The exercise prices, vesting, and other restrictions were determined at the discretion of Compensation Committee of the Board. Following the completion of the Company’s IPO in June 2021, no additional awards and no shares of the Company’s common stock remain available for future issuance under the 2011 Plan. However, the 2011 Plan will continue to govern the terms and conditions of the outstanding awards previously granted thereunder. 2021 Stock Incentive Plan In May 2021, the Company's Board adopted, and its stockholders approved, the 2021 Stock Incentive Plan (the “2021 Plan”), which became effective upon the SEC declaring the Company’s IPO registration statement effective. The 2021 Plan provides for the grant of incentive stock options, nonstatutory stock options, restricted share awards, stock unit awards (“RSUs”), stock appreciation rights, cash-based awards, and performance-based stock awards, or collectively, stock awards. ISOs may be granted only to the Company’s employees, including officers, and the employees of its parent or subsidiaries. All other stock awards may be granted to the Company’s employees, officers, non-employee directors, consultants, and the employees and consultants of its parent, subsidiaries, and affiliates. The requisite service period for RSUs to vest is generally over four years from the grant date, with 25% vesting on the first anniversary and the balance vesting ratably on a quarterly basis over the remaining vesting period. Additional RSUs vest ratably on a quarterly basis over three The aggregate number of shares of the Company’s common stock that may be issued pursuant to stock awards under the 2021 Plan will not exceed the sum of (x) 4,333,333 shares (as adjusted for stock splits, stock dividends, combinations, and the like), plus (y) the sum of (1) the number of reserved shares not issued or subject to outstanding awards under the 2011 Plan on the effective date of the 2021 Plan and (2) the number of shares subject to outstanding stock awards granted under the 2011 Plan and that, following the effective date of the 2021 Plan, (A) are subsequently forfeited or terminated for any reason before being exercised or settled, (B) are not issued because such stock award is settled in cash, (C) are subject to vesting restrictions and are subsequently forfeited, (D) are withheld or reacquired to satisfy the applicable exercise, strike, or purchase price, or (E) are withheld or reacquired to satisfy a tax withholding obligation, plus (z) an annual increase on the first day of each fiscal year, for a period of not more than 10 years, beginning on January 1, 2022 and ending on, and including, January 1, 2031, in an amount equal to the lesser of (i) 5% of the outstanding shares on the last day of the immediately preceding fiscal year or (ii) such lesser amount that the Compensation Committee of the Board determines for purposes of the annual increase for that fiscal year. On January 1, 2023, the number of shares of common stock available for issuance under the 2021 Plan was automatically increased according to its terms by 1,963,010 shares. As of December 31, 2023, 3,119,122 shares were available for future grants of the Company’s common stock. Stock Option Valuation No stock options were granted during the year ended December 31, 2023. The following table presents, on a weighted-average basis, the assumptions used in the Black Scholes option-pricing model to determine the grant-date fair value for the years ended December 31, 2022 and 2021: Year Ended December 31, 2022 2021 Expected term in years 6.0 6.0 Expected stock price volatility 64.6% 67.5% Risk-free interest rate 2.3% 1.1% Expected dividend yield — — Stock Options The following table summarizes the Company’s stock option activity since December 31, 2022: Number of Weighted- Weighted- Aggregate Outstanding as of December 31, 2022 4,034,287 $ 6.90 6.9 $ 1,625 Granted — — Exercised (89,251) 3.94 Cancelled/Forfeited (113,326) 6.90 Outstanding as of December 31, 2023 3,831,710 $ 6.97 5.8 $ 826 Options exercisable as of December 31, 2023 2,868,616 $ 6.43 5.1 $ 826 Options vested and expected to vest as of December 31, 2023 3,831,710 $ 6.97 5.8 $ 826 The aggregate intrinsic value of stock options is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s common stock for all stock options that had exercise prices lower than the fair value of the Company’s common stock. The aggregate intrinsic value of stock options exercised was $0.1 million, $1.3 million, and $4.8 million during the years ended December 31, 2023, 2022, and 2021 respectively. No stock options were granted during the year ended December 31, 2023. The weighted-average grant-date fair value per share of stock options granted was $4.43, and $6.20 during the years ended December 31, 2022 and 2021, respectively. The total fair value of stock options vested was $3.4 million, $3.5 million, and $1.5 million during the years ended December 31, 2023, 2022, and 2021, respectively. The stock options granted during the year ended December 31, 2021 included 615,997 stock options granted to executive officers that include a performance condition related to a sale event or initial public offering occurring before December 31, 2021 in addition to the standard service condition. These options will vest over four years, with approximately 21% vesting on January 1, 2022, and the balance vesting ratably over the remaining 38 months. During each of the years ended December 31, 2023, 2022, and 2021 $0.7 million of stock-based compensation expense was recognized for options having a performance condition. Restricted Stock Units The following table summarizes the activity related to the Company's restricted stock units: Outstanding Restricted Stock Units Weighted- Outstanding as of December 31, 2022 2,807,981 $ 7.85 Granted 3,044,620 3.96 Vested (1,516,530) 6.38 Cancelled/Forfeited (935,582) 6.47 Outstanding as of December 31, 2023 3,400,489 $ 5.40 The estimated weighted-average grant date fair value of restricted stock units granted was $3.96, $7.51, and $15.32 per share for the years ended December 31, 2023, 2022, and 2021 respectively. The total grant date fair value of restricted stock units vested was $9.7 million, $6.7 million, and less than $0.1 million for the years ended December 31, 2023, 2022, and 2021 respectively. Employee Stock Purchase Plan In May 2021, the Company's Board adopted, and its stockholders approved, the Company's 2021 Employee Stock Purchase Plan (the "ESPP"). A total of 1,572,504 shares of the Company's authorized but unissued or reacquired shares of its common stock (as adjusted for stock splits, stock dividends, combinations, and the like) are available for issuance under the ESPP. The number of shares of the Company's common stock that will be available for issuance under the ESPP also includes an annual increase on the first day of each fiscal year, for a period of not more than 10 years, beginning on January 1, 2022, equal to the least of: (i) 1% of the outstanding shares of the Company’s common stock on such date, (ii) 400,000 shares (as adjusted for stock splits, stock dividends, combinations, and the like) or (iii) a lesser amount determined by the Compensation Committee or the Company’s Board of Directors. On January 1, 2023, the number of shares of common stock available for issuance under the ESPP was automatically increased according to its terms by 392,602 shares. During regularly scheduled “offerings” under the ESPP, participants may purchase the Company’s common stock through payroll deductions, up to a maximum of 15% of their eligible compensation, or such lower limit as may be determined by the Compensation Committee from time to time. Participants will be able to withdraw their accumulated payroll deductions prior to the end of the offering period in accordance with the terms of the offering. Participation in the ESPP will end automatically on termination of employment. The purchase price will be specified pursuant to the offering, but cannot, under the terms of the ESPP, be less than 85% of the fair market value per share of the Company’s common stock on either the offering date or on the purchase date, whichever is less. The fair market value of the Company’s common stock for this purpose will generally be the closing price on Nasdaq (or such other exchange as the Company’s common stock may be traded at the relevant time) for the date in question, or if such date is not a trading day, for the last trading day before the date in question. As of December 31, 2023, an initial offering period has not commenced, and for the year ended December 31, 2023, no shares of common stock were purchased under the ESPP. Stock-Based Compensation Expense The following table summarizes the classification of the Company’s stock-based compensation expense in the consolidated statements of operations: Year Ended December 31, (in thousands) 2023 2022 2021 Cost of revenue $ 390 $ 574 $ 81 Sales and marketing 2,899 2,522 559 Technology development 3,609 4,118 707 General and administrative 5,465 4,000 1,492 Total stock-based compensation expense $ 12,363 $ 11,214 $ 2,839 Stock-based compensation capitalized in connection with the Company’s internal-use software was $0.2 million for the year ended December 31, 2023, and less than $0.1 million for the year ended December 31, 2022. As of December 31, 2023, total unrecognized compensation expense related to unvested stock-based awards was $21.9 million, which is expected to be recognized over a weighted-average period of 2.2 years.

Income Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Net loss before income taxes for the years ended December 31, 2023, 2022, and 2021 was as follows: Year Ended December 31, (in thousands) 2023 2022 2021 United States $ (22,844) $ (22,651) $ (20,986) Foreign 159 150 44 Total $ (22,685) $ (22,501) $ (20,942) For the years ended December 31, 2023, 2022, and 2021, the provision for income taxes consisted of the following: Year Ended December 31, (in thousands) 2023 2022 2021 Current U.S. Federal $ — $ — $ — State 14 37 21 Foreign — — — Total current expense $ 14 $ 37 $ 21 Deferred U.S. Federal — — — State — — — Foreign — — — Total deferred expense — — — Total provision for income taxes $ 14 $ 37 $ 21 The reconciliation of the U.S. federal statutory rate to the Company’s effective rate is as follows: Year Ended December 31, 2023 2022 2021 Income tax benefit using U.S. federal statutory rate 21.0% 21.0% 21.0% State income taxes, net of federal benefit 4.1 5.0 4.7 Nondeductible expenses (0.7) (0.3) (0.1) Tax law change — — 0.2 Research credits 0.2 0.1 1.0 Sale of Design Manager — (2.2) — Stock-based compensation (3.1) (0.3) 0.4 Change in the valuation allowance (21.2) (23.5) (27.2) Other (0.4) — (0.1) Provision for income taxes (0.1)% (0.2)% (0.1)% Deferred income taxes arise from temporary differences between the tax basis of assets and liabilities and their reported amounts in the consolidated financial statements. The significant components of the Company’s deferred income tax assets and liabilities at December 31, 2023 and 2022 were comprised of the following: Year Ended December 31, (in thousands) 2023 2022 Deferred tax assets Net operating losses $ 31,710 $ 32,508 Research credits 3,092 3,065 Property and equipment 363 422 Intangible assets and goodwill 1,074 1,293 Capitalized research and development expense 9,630 4,750 Operating lease liabilities 5,541 6,204 Stock-based compensation 2,295 1,716 Other 1,903 1,464 Total deferred tax assets $ 55,608 $ 51,422 Valuation allowance (49,814) (44,951) Net deferred tax assets $ 5,794 $ 6,471 Deferred tax liabilities Capitalized internal-use software (674) (754) Right-of-use assets (4,968) (5,580) Other (152) (137) Total deferred tax liabilities $ (5,794) $ (6,471) Net deferred tax liabilities $ — $ — A valuation allowance is required to be established when it is more likely than not that all or a portion of a deferred tax asset will not be realized. The Company considered the scheduled reversal of deferred tax liabilities and projected future taxable income in making this assessment. Based upon the level of historical taxable income and projections for future taxable income over the periods in which the deferred tax assets are deductible, the Company believes it is more likely than not that the benefits of these deductible differences will not be fully realizable at December 31, 2023 and 2022. Accordingly, the Company has applied a valuation allowance against its net deferred tax assets. The net change in the total valuation allowance for the years ended December 31, 2023 and 2022 was an increase of approximately $4.9 million and $5.2 million, respectively. The activity in the Company’s deferred tax asset valuation allowance for the years ended December 31, 2023 and 2022, was as follows: Year Ended December 31, (in thousands) 2023 2022 Valuation allowance at beginning of year $ 44,951 $ 39,725 Increases recorded to income tax provision 4,887 5,226 Decreases recorded to equity (24) — Valuation allowance at end of year $ 49,814 $ 44,951 At December 31, 2023, the Company had approximately $112.8 million and $119.2 million of federal and state net operating loss (“NOL”) carryforwards, respectively. Approximately $52.6 million of the federal NOL and $80.0 million of the state NOL was generated prior to the 2018 tax year. As a result, these net operating loss carryforwards will expire, if not utilized, between 2031 and 2037 for federal and state income tax purposes. The post 2017 NOLs are subject to an indefinite carryforward period; therefore, $60.2 million of federal NOLs generated after 2017 may be carried forward indefinitely. As it pertains to the approximately $39.2 million of state NOLs generated after 2017, not all states have conformed to the Act; therefore, some state’s NOLs are unlimited while some will expire based on the respective state. The Company also has federal and state tax credits relating to research and development credits of $4.1 million and less than $0.1 million, which begin to expire in 2031. The utilization of NOLs and tax credit carryforwards to offset future taxable income may be subject to an annual limitation as a result of ownership changes that have occurred previously or may occur in the future. Under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended (“IRC”), a corporation that undergoes an ownership change may be subject to limitations on its ability to utilize its pre-change NOLs and other tax attributes otherwise available to offset future taxable income and/or tax liability. An ownership change is defined as a cumulative change of 50% or more in the ownership positions of certain stockholders during a rolling three-year period. The Company completed formal studies through December 31, 2022 to determine if any ownership changes within the meaning of IRC Section 382 and 383 have occurred. As a result of the studies, the Company determined that although it experienced an ownership change on July 28, 2015, the limitation from the ownership change will not result in any of the NOLs or tax credits expiring unutilized. No additional ownership changes have occurred through the date of the most recent study. The Tax Cuts and Jobs Act of 2017 (“TCJA”) requires taxpayers to capitalize and amortize research and development costs pursuant to IRC Section 174. This requirement was effective for the Company beginning on January 1, 2022. The Company assesses foreign investment levels periodically to determine if all or a portion of the Company’s investments in its foreign subsidiary are indefinitely invested. The Company’s current intention is to permanently reinvest undistributed earnings of our foreign subsidiary. Any required adjustment to the income tax provision would be reflected in the period that the Company changes this assessment. The calculation of the Company’s tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations for both federal taxes and the many states in which it operates or does business in. A tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, on the basis of the technical merits. The Company records uncertain tax positions as liabilities in accordance with ASC 740-10 and adjusts these liabilities when the Company’s judgment changes as a result of the evaluation of new information not previously available. Because of the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from the Company’s current estimate of the unrecognized tax benefit liabilities. These differences will be reflected as increases or decreases to income tax expense in the period in which new information is available. As of December 31, 2023 and 2022, the Company had liabilities for uncertain tax positions of $1.0 million, which, if recognized, would not impact the Company’s tax provision and effective income tax rate due to a full valuation allowance. The Company’s policy is to record interest and penalties related to income taxes as part of its income tax provision. As of December 31, 2023 and 2022, the Company had not accrued interest or penalties related to uncertain tax positions. A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows: Year Ended December 31, (in thousands) 2023 2022 Gross tax contingencies as of beginning of year $ 1,022 $ 1,016 Increases in gross tax contingencies 9 6 Gross tax contingencies as of end of year $ 1,031 $ 1,022 The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, foreign jurisdictions, and various state and local jurisdictions. The Company’s federal and state tax returns for the tax years ended December 31, 2013 and forward generally remain subject to examination from the Internal Revenue Service and state tax authorities. However, the federal and state tax authorities can generally reduce a net operating loss (but not create taxable income) for a period outside the statutes of limitations in order to determine the correct amount of net operating loss which may be allowed as a deduction against income for a period within the statutes of limitations. Therefore, the Company’s tax years generally remain open to examination for all federal and state income tax matters until its net operating loss carryforwards are utilized and the respective statutes of limitations have lapsed. The returns in U.S. and state jurisdictions have varying statutes of limitations. The Company’s income tax returns for December 31, 2015 through December 31, 2023 for their foreign subsidiary remain subject to examination by tax authorities in the United Kingdom.

Net Loss Per Share

Net Loss Per Share	12 Months Ended
Net Loss Per Share	Dec. 31, 2023
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss Per Share The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders for the years ended December 31, 2023, 2022, and 2021: Year Ended December 31, (in thousands, except share and per share amounts) 2023 2022 2021 Numerator: Net loss $ (22,699) $ (22,538) $ (20,963) Accretion of redeemable convertible preferred stock to redemption value — — (7,061) Net loss attributable to common stockholders $ (22,699) $ (22,538) $ (28,024) Denominator: Weighted average common shares outstanding—basic and diluted 39,724,697 38,479,437 26,059,744 Net loss per share attributable to common stockholders—basic and diluted $ (0.57) $ (0.59) $ (1.08) The Company’s potentially dilutive securities, which include outstanding stock options and restricted stock units, and in prior years redeemable convertible preferred stock, and warrants to purchase shares of common stock, have been excluded from the computation of diluted net loss per share from each period as including them would have had an anti-dilutive effect. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potentially dilutive securities for each period presented: Year Ended December 31, 2023 2022 2021 Options to purchase common stock 3,831,710 4,034,287 3,949,943 Restricted stock units 3,400,489 2,807,981 309,530 Total 7,232,199 6,842,268 4,259,473

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Contractual Obligations The Company has $33.3 million of non-cancelable contractual commitments as of December 31, 2023, primarily related to its operating lease agreements for both its current and former corporate headquarters in New York, NY, not including any offset for sublease income, as well as other software and support services. For those agreements with variable terms, the Company does not estimate what the total obligation may be beyond any minimum obligations. The following table represents the Company’s commitments under its purchase obligations as of December 31, 2023 (in thousands): Fiscal Year Ending December 31, Lease Obligations Other Obligations Total Obligations 2024 $ 4,659 $ 1,784 $ 6,443 2025 5,381 922 6,303 2026 5,263 376 5,639 2027 5,263 98 5,361 2028 5,263 14 5,277 Thereafter 4,292 — 4,292 Total $ 30,121 $ 3,194 $ 33,315 Legal Proceedings The Company is subject to various claims and contingencies which are in the scope of ordinary and routine litigation incidental to its business, including those related to regulation, litigation, business transactions, employee-related matters, and taxes, among others. When the Company becomes aware of a claim or potential claim, the likelihood of any loss or exposure is assessed. If it is probable that a loss will result and the amount of the loss can be reasonably estimated, the Company records a liability for the loss. The liability recorded includes probable and estimable legal costs incurred to date and future legal costs to the point in the legal matter where the Company believes a conclusion to the matter will be reached. If the loss is not probable or the amount of the loss cannot be reasonably estimated, the Company discloses the claim if the likelihood of a potential loss is reasonably possible. The Company does not believe that it is a party to any pending legal proceedings that are likely to have a material effect on its business, financial condition or results of operations for the years ended December 31, 2023 and 2022. Indemnification In the ordinary course of business, the Company may provide indemnification of varying scope and terms to vendors, lessors, business partners and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its Board and officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is, in many cases, unlimited. To date, the Company has not incurred any material costs as a result of such indemnifications. Sales and other non-income tax contingencies The Company conducts operations in many tax jurisdictions for which non-income-based taxes, such as sales, use and other indirect taxes, are assessed on its operations. Although the Company is diligent in collecting and remitting such taxes, there is uncertainty as to what constitutes sufficient presence or responsibility for a jurisdiction to levy taxes, fees, and surcharges for sales made on an e-commerce platform. The Company recognized liabilities for contingencies related to sales and other non-income taxes deemed probable and estimable totaling $2.5 million and $1.9 million as of December 31, 2023 and 2022, respectively, which are included in other current liabilities in the Company’s consolidated balance sheets.

401(K) Savings Plans

401(K) Savings Plans	12 Months Ended
401(K) Savings Plans	Dec. 31, 2023
Retirement Benefits [Abstract]
401(K) Savings Plans	401(K) Savings Plans

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net loss	$ (22,699)	$ (22,538)	$ (20,963)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	12 Months Ended
Insider Trading Arrangements	Dec. 31, 2023 shares	Dec. 31, 2023 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Thomas Etergino [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On September 11, 2023, Thomas Etergino, our Chief Financial Officer, entered into a Rule 10b5-1 trading arrangement that provides for the sale of up to 18,000 shares of our common stock. This trading arrangement is scheduled to expire on July 31, 2024.
Name	Thomas Etergino
Title	Chief Financial Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 11, 2023
Arrangement Duration	324 days
Nancy Hood [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On September 15, 2023, Nancy Hood, our Chief Marketing Officer, entered into a Rule 10b5-1 trading arrangement that provides for the sale of up to (i) 8,400 shares of our common stock and (ii) the net shares (not yet determinable) after shares are withheld to satisfy tax obligations subject to the vesting of up to 28,207 RSUs. This trading arrangement is scheduled to expire on December 13, 2024.
Name	Nancy Hood
Title	Chief Marketing Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 15, 2023
Arrangement Duration	455 days
Matthew Rubinger [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On September 15, 2023, Matthew Rubinger, our Chief Commercial Officer, entered into a Rule 10b5-1 trading arrangement that provides for the sale of up to the net shares (not yet determinable) after shares are withheld to satisfy tax obligations subject to the vesting of up to 48,434 RSUs. This trading arrangement is scheduled to expire on December 31, 2024.
Name	Matthew Rubinger
Title	Chief Commercial Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 15, 2023
Arrangement Duration	473 days
Trading Arrangement, Common Stock [Member] \| Thomas Etergino [Member]
Trading Arrangements, by Individual
Aggregate Available	18,000	18,000
Trading Arrangement, Common Stock [Member] \| Nancy Hood [Member]
Trading Arrangements, by Individual
Aggregate Available	8,400	8,400
Trading Arrangement, RSUs [Member] \| Nancy Hood [Member]
Trading Arrangements, by Individual
Aggregate Available	28,207	28,207
Trading Arrangement, RSUs [Member] \| Matthew Rubinger [Member]
Trading Arrangements, by Individual
Aggregate Available	48,434	48,434

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	The accompanying consolidated financial statements are prepared in accordance with the accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of the Company and its wholly-owned subsidiaries, 1stdibs.com, Ltd. and 1stdibs Design Manager, Inc. (“Design Manager”). The Company sold its equity interest in Design Manager on June 29, 2022, therefore, the consolidated statements of operations for the year ended December 31, 2022 include activity relating to Design Manager through the sale date. The consolidated balance sheets as of December 31, 2023 and 2022 no longer includes the assets, liabilities, and equity amounts associated with Design Manager.
Use of Estimates	The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions reflected in these consolidated financial statements include, but are not limited to, revenue recognition, provision for transaction losses, impairment assessment of goodwill, capitalization of internal-use software and determination of useful lives, income taxes, and the valuation of stock-based compensation and leases. The Company evaluates its estimates and assumptions on an ongoing basis. Actual results could differ from those estimates and such differences may be material to the consolidated financial statements.
Foreign Currency and Currency Translation	The Company has determined that the functional currency for its foreign operation is the currency of the primary cash flow of the operation, which is generally the local currency in which the operation is located. All assets and liabilities are generally translated into U.S. dollars using exchange rates in effect at the balance sheet date. Income and expenses are translated at the average exchange rate in effect during the period. Unrealized translation gains and losses are recorded as a translation adjustment, which is included in the consolidated statements of redeemable convertible preferred stock and stockholders’ equity (deficit) as a component of accumulated other comprehensive loss. Adjustments that arise from exchange rate changes on transactions denominated in a currency other than the local currency are included in foreign exchange gain (loss) in other, net in the consolidated statements of operations.
Segment Information	An operating segment is defined as a component of a business for which separate financial information is available that is evaluated regularly by the chief operating decision maker. The Company operates and manages its business as one reportable and operating segment. The Company’s chief executive officer, who is the chief operating decision maker, reviews financial information on a consolidated basis for purposes of evaluating financial performance and allocating resources. The Company’s single reportable and operating segment contains one reporting unit, which consists of the Company’s online marketplace that enables commerce between sellers and buyers.
Business Combinations	The Company accounts for business combinations using the acquisition method of accounting. The Company measures the tangible and intangible identifiable assets acquired, liabilities assumed, any non-controlling interest in the acquiree, and contingent consideration at fair value as of the acquisition date. Any excess purchase price over the fair value of net assets acquired is recorded as goodwill. Measurement period adjustments, if any, to the preliminary estimated fair value of the intangibles assets as of the acquisition date are recorded in goodwill. The results of businesses acquired in a business combination are included in the Company’s consolidated financial statements from the date of acquisition. Acquisition-related expenses represent expenses incurred by the Company to effect a business combination, including expenses such as finder’s fees and advisory, legal, accounting, valuation, and other professional or consulting fees, and are not included as a component of consideration transferred, but are accounted for as an expense in the period in which the costs are incurred or the services are rendered.
Concentrations of Credit Risk	Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents. Cash and cash equivalents are placed with large financial institutions that management believes are of high credit quality. At times, the Company’s cash balances with individual banking institutions are in excess of federally insured limits. The Company has not experienced any credit losses related to its cash and cash equivalents balance.
Cash, Cash Equivalents, and Restricted Cash	The Company considers all short-term, highly liquid investments purchased with an original maturity of three months or less at the date of purchase to be cash equivalents. Certain cash equivalents consist of investments in debt securities that are classified as available-for-sale.
Short-term Investments	Short-term investments designated as available-for-sale securities are carried at fair value, which is based on quoted market prices for such securities, if available, or is estimated on the basis of quoted market prices of financial instruments with similar characteristics. Investments with original maturities greater than 90 days and less than one year are classified within short-term investments on the Company’s consolidated balance sheets. In addition, investments with maturities beyond one year at the time of purchase that are highly liquid in nature and represent the investment of cash that is available for current operations are classified as short-term investments. Any other investments with original maturities greater than one year would be classified within long-term investments. Additionally, the Company records accrued interest receivable within other current assets on its consolidated balance sheets. Accrued interest receivable was $0.5 million as of December 31, 2023 and there was no accrued interest receivable as of December 31, 2022. Unrealized gains and losses of available-for-sale securities are excluded from earnings and are reported as a component of other comprehensive income (loss) until the security is sold, has matured, or the Company determines that the fair value of the security has declined below its adjusted cost basis and the decline is not due to a credit loss. Realized gains and losses on short-term investments are calculated based on the specific identification method and are reclassified from accumulated other comprehensive loss to other, net in the Company’s consolidated statements of operations.
Accounts Receivable, net	The Company’s accounts receivable are recorded at amounts billed to sellers, generally for non-transactional revenue, which includes subscription, listing fees and advertising revenue, and are presented net of an estimated allowance for doubtful accounts on the Company’s consolidated balance sheets. The Company’s accounts receivable do not bear interest and do not require collateral or other security to support related receivables. The allowance for doubtful accounts considers forward-looking information to estimate expected credit losses using a number of factors, including age of the receivable, current economic conditions, historical losses, and management’s assessment and judgment of the sellers. The evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. Losses are charged against the allowance when management believes the un-collectability of a receivable is confirmed and subsequent recoveries, if any, are credited to the allowance. Account balances are written off after all means of collection are exhausted and the potential for non-recovery is determined to be probable. Adjustments to the allowance for doubtful accounts are recorded as a component of provision for transaction losses in the consolidated statements of operations.
Receivables from Payment Processors and Payables Due to Sellers	Receivables from payment processors represent amounts received from buyers via third-party payment processors which will be deposited by the payment processors to 1stDibs’ bank accounts for payment to sellers and shipping carriers. The Company also collects sales tax from buyers on behalf of sellers in certain jurisdictions as a marketplace facilitator and remits these collected taxes directly to the tax authorities. The portion of the cash and related receivable remaining after deducting the Company’s commission and processing fees represents the total payables due to third parties, which consists of payables due to sellers, payables due to shipping carriers in instances where 1stDibs’ shipping services are elected by sellers, and payables due to tax authorities. The Company establishes
Property and Equipment, net	Property and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives. The Company capitalizes costs related to internal-use software during the application development stage, including consulting costs and compensation expenses related to employees who devote time to the development projects. The Company records software development costs in property and equipment, net. Costs incurred in the preliminary stages of development activities and post implementation activities are expensed in the period incurred and are included in technology development in the consolidated statements of operations. The Company also capitalizes costs related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Once the project is available for general release, capitalization ceases, and asset amortization begins. Capitalized costs associated with internal-use software are amortized on a straight-line basis over their estimated useful life, which is generally three years, and are included in cost of revenue in the consolidated statements of operations. The general range of useful lives of property and equipment is as follows: Estimated Useful Life Leasehold improvements Lesser of lease term or life of asset Furniture and fixtures 3 years Computer equipment and software 3 years Internal-use software Lesser of contract term or 3 years When assets are sold or retired, the cost and related accumulated depreciation or amortization of assets disposed of are removed from the accounts, with any resulting gain or loss recorded in income from operations in the consolidated statements of operations and consolidated statements of comprehensive loss. Costs of repairs and maintenance are expensed as incurred.
Goodwill	Goodwill represents the excess of cost over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. Goodwill is not amortized but is tested for impairment annually or more frequently if events or changes in circumstances indicate that the asset may be impaired. The Company’s goodwill is evaluated at the entity level as it is determined there is one reporting unit, 1stDibs. The Company performs its annual goodwill impairment test as of October 1st or more frequently if events or changes in circumstances indicate that the goodwill may be impaired. The Company has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines it is not more likely than not that the fair value of the reporting unit is less than its carrying amount, then additional impairment testing is not required. However, if the Company concludes otherwise, then it is required to perform a quantitative assessment for impairment. The quantitative assessment involves comparing the estimated fair value of the reporting unit with its respective book value, including goodwill. If the estimated fair value exceeds book value, goodwill is not impaired. If the book value of the reporting unit exceeds the fair value, an impairment loss is recognized in an amount equal to the excess, not to exceed the total amount of goodwill allocated to the reporting unit.
Leases	Effective January 1, 2022, the Company adopted ASU 2016-02, utilizing the modified retrospective adoption approach. The Company enters into contracts in the normal course of business and assesses whether any such contracts contain a lease. The Company determines if an arrangement is a lease at inception if it conveys the right to control the identified asset for a period of time in exchange for consideration. The Company classifies leases as operating or financing in nature, and records the associated right-of-use asset and lease liability on its consolidated balance sheet. The lease liability represents the present value of future lease payments, net of lease incentives, discounted using an incremental borrowing rate, which is a management estimate based on the information available at the commencement date of a lease arrangement. Lease expense is recognized as a single lease cost on a straight-line basis over the lease term. The lease term consists of non-cancelable periods and may include options, including those to extend or terminate, if it is reasonably certain they will be exercised. The Company accounts for lease and non-lease components related to operating leases as a single lease component. The Company has elected that costs associated with leases having an initial term of 12 months or less ("short-term leases") are recognized in the consolidated statement of operations on a straight-line basis over the lease term and are not recorded on the balance sheet. Variable lease expense is recognized as incurred and consists primarily of real estate taxes, utilities, and other office space related expenses.
Contingencies	The Company has certain contingent liabilities that arise in the ordinary course of business activities. The Company accrues for loss contingencies when losses become probable and are reasonably estimable. If the reasonable estimate of the loss is a range and no amount within the range is a better estimate, the minimum amount of the range is recorded as a liability on the Company’s consolidated balance sheets. The Company does not accrue for contingent losses that, in its judgment, are considered to be reasonably possible, but not probable.
Fair Value of Financial Instruments	Certain assets and liabilities are carried at fair value in accordance with GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value require the Company to maximize the use of observable inputs and minimize the use of unobservable inputs. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies, and similar techniques.
Income Taxes	Income taxes are computed using the asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the Company’s consolidated financial statements. In estimating future tax consequences, the Company considers all expected future events other than enactment of changes in tax laws or rates. A valuation allowance is recorded, if necessary, to reduce net deferred tax assets to their realizable values if management does not believe it is more likely than not that the net deferred tax assets will be realized. The Company follows the provisions of the authoritative guidance from the Financial Accounting Standards Board (“FASB”) on accounting for uncertainty in income taxes. These provisions provide a comprehensive model for the recognition, measurement, and disclosure in the financial statements of uncertain income tax positions that a company has taken or expects to take on a tax return. Under these provisions, a company can recognize the benefit of an income tax position only if it is more likely than not (greater than 50%) that the tax position will be sustained upon tax examination, based solely on the technical merits of the tax position. Otherwise, no benefit can be recognized. Assessing an uncertain tax position begins with the initial determination of the sustainability of the position and is measured at the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. As of each balance sheet date, unresolved uncertain tax positions must be reassessed. Additionally, the Company must accrue interest and related penalties, if applicable, on all tax exposures for which reserves have been established consistent with jurisdictional tax laws. The Company’s policy is to recognize interest and penalties related to uncertain tax positions in the provision for income taxes. As of December 31, 2023 and 2022, the Company had no accrued interest or penalties related to uncertain tax positions. The Company assesses foreign investment levels periodically to determine if all or a portion of the Company’s investments in its foreign subsidiary are indefinitely invested. Any required adjustment to the income tax provision (benefit) would be reflected in the period that the Company changes this assessment.
Net Loss per Share Attributable to Common Stockholders	The Company applies the two-class method to compute basic and diluted net loss per share when shares meet the definition of participating securities. The two-class method determines net loss per share for each class of common and participating securities according to dividends declared or accumulated and participation rights in undistributed earnings. The two- class method requires income available to common stockholders for the period to be allocated between common and participating securities based upon their respective rights to receive dividends as if all income for the period has been distributed. During periods of loss, there is no allocation required under the two-class method. Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted average number of common shares outstanding for the period without consideration of potentially dilutive common stock. Diluted earnings per share attributable to common stockholders is computed by dividing the diluted earnings attributable to common stockholders by the weighted average number of common shares outstanding for the period, including potential dilutive common shares. For periods in which the Company reports net losses, diluted net loss per common share attributable to common stockholders is the same as basic net loss per common share attributable to common stockholders because potentially dilutive shares of common stock are not assumed to have been issued since their effect is anti-dilutive.
Treasury Stock	The repurchased common stock is classified as treasury stock on the consolidated balance sheets. The direct costs incurred to acquire treasury stock are treated like stock issue costs and added to the cost of the treasury stock, which includes applicable fees and taxes. Repurchased common stock is stated at cost, determined on an average cost basis and is presented as a reduction of stockholders’ equity on the consolidated balance sheets.
Revenue from Contract with Customer	Revenue Recognition The Company’s net revenue consists principally of seller marketplace services, advertisements, and prior to the sale of Design Manager, software services. Seller marketplace services primarily consist of marketplace transactions, subscriptions, and listing fees. Revenue is recognized as the Company transfers control of promised goods or services to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The Company evaluates whether it is appropriate to recognize revenue on a gross or net basis based upon its evaluation of whether the Company obtains control of the specified goods or services by considering if it is primarily responsible for fulfillment of the promise, has inventory risk, has the latitude in establishing pricing and selecting suppliers, among other factors. The Company does not have any remaining performance obligations associated with contracts with terms greater than one year. Seller Marketplace Services (Marketplace Transactions, Subscriptions, and Listings) The Company charges sellers commission and processing fees for successful purchases through its online marketplace. For the items purchased through the 1stDibs online marketplace, the Company collects the gross merchandise value from the buyer, and recognizes the associated revenue on a net basis, which equates to the commission and processing fees earned in exchange for the seller marketplace services. The commission fees range from 5% to 50% and processing fees are 3% of the buyer’s total payment, net of expected refunds. If a seller accepts a return or refund of an on-platform purchase, the related commission and processing fees are refunded to the seller. The Company records discounts provided to the end buyer, to whom the Company has no performance obligation, such as promotional discounts, in sales and marketing expense since the discounts are not related directly to the Company’s revenue source but rather used as a marketing tool, and the seller is not made aware of the discounts provided to the end buyer. The commission and processing fees are recognized net of estimated refunds when the corresponding transaction is confirmed by the buyer and seller. The Company does not take title to inventory sold or assume risk of loss at any point in time during the transaction and is authorized to collect consideration from the buyer and remit net consideration to the seller to facilitate the processing of the confirmed purchase transaction. We offer our sellers various subscription pricing tiers which allows them to choose the plan that best fits their business, with choices of a higher monthly subscription fee and lower commission rates or a lower monthly subscription fee and higher commission rates. Additionally, some sellers have no monthly subscription fees and higher commission rates, however, the Company no longer offers this option to new sellers. Sellers receive the benefit of marketplace activities, including listing items for sale, completing sales transactions, and payments processing, which represents a single stand-ready performance obligation. The Company has determined that its customers are sellers on its online marketplace since sellers pay for the use of the platform to sell their inventory. For sellers that pay a subscription, it is on an annual basis, payable monthly, therefore the fee is recognized monthly. If during the annual subscription period a seller ceases to make its monthly payment, the Company is no longer obligated to provide the subscribed services and the seller can be terminated at the Company’s sole discretion. The Company earns listing fees from sellers on a per item basis as directed by the seller to promote certain items at the seller’s discretion. Listing fees are recognized ratably over time when the listing is publicly posted. Advertisements Advertising revenue is generated by displaying seller ads on the 1stDibs online marketplace. For advertising services, the Company enters into agreements with advertisers, or sellers, in the form of signed insertion orders, which specify the terms of services and fees, prior to advertising campaigns being run. The Company recognizes revenue from the display of impression-based ads in the period in which the impressions are delivered in accordance with the contractual terms of the insertion orders. Impressions are considered delivered when an ad is displayed to users. Software Services Through the Company’s former subsidiary, Design Manager, the Company offered subscriptions to access software typically used by interior designers. Subscriptions did not provide customers with the right to take possession of the software supporting the applications and, as a result, were accounted for as service contracts. The Company offered both monthly and annual subscriptions. For software services, the Company offered subscriptions to customers that were tailored to design firms as an end-to-end business solution for project management and accounting and entered into agreements with the customers through their acceptance of online terms of service, which specified the terms of services and fees, prior to the customers receiving access to the software platform. On June 29, 2022, the Company sold Design Manager and no revenue related to software services has been recognized since the sale date. Contract Costs The Company capitalizes commission costs that are incremental and directly related to the acquisition of seller agreements. Commissions are earned by the Company’s sales force when the seller’s listings are publicly visible and available for purchase on the 1stDibs online marketplace. Commission costs are capitalized when earned and are amortized as expense over an estimated seller relationship period of three years. The Company determined the estimated seller relationship period by taking into consideration the contractual term of the seller agreements, the seller’s lifetime expected value, and the fact that no additional commission is paid for renewed seller agreements. The Company periodically reviews the costs to obtain revenue contracts to determine whether events or changes in circumstances have occurred that could impact the period of benefit of these costs to obtain revenue contracts. Contract Balances from Contracts with Customers A contract liability is an obligation to transfer goods or services for which consideration has been received or is due to a customer. Contract liabilities consist of deferred revenue that is unearned related to advertising fees charged to sellers for which advertisements have not been delivered and to a lesser extent setup fees charged to new sellers at the inception of service. Prior to the sale of Design Manager deferred revenue also included software subscription fees. Deferred revenue for software and advertising fees is recognized as revenue in the periods in which our performance obligations are satisfied. Deferred revenue for setup fees is recognized as revenue over the expected life of the seller relationship, which the Company determined to be three years. As of December 31, 2023 and 2022, deferred revenue was $0.1 million and $0.2 million, respectively. The current portion of deferred revenue was $0.1 million as of both December 31, 2023 and 2022, and are included in other current liabilities in the Company’s consolidated balance sheets. The non-current portion of deferred revenue was less than $0.1 million as of both December 31, 2023 and 2022, and is included in other liabilities in the Company’s consolidated balance sheets. Cost of Revenue Cost of revenue includes payment processor fees, hosting expenses, and resold software usage and services. No resold software usage and services expense has been recognized after the sale of Design Manager. Cost of revenue also includes expenses associated with payroll, employee benefits, stock-based compensation, other headcount-related expenses associated with personnel supporting revenue-related operations, amortization of internal-use software, and consulting costs. In certain transactions where 1stDibs shipping and logistics services are elected by sellers, the Company enables shipping of items purchased from the seller to the buyer. Any difference between the amount collected for shipping and the amount charged by the shipping carrier is included in cost of revenue in the consolidated statements of operations.
Sales and Marketing	Sales and marketing expenses include payroll, employee benefits, stock-based compensation, other headcount-related expenses associated with sales and marketing personnel, advertising expense, consulting costs, and promotional discounts offered to new and existing buyers. Advertising expenses consist primarily of costs incurred promoting and marketing the Company’s online marketplace, such as costs associated with acquiring new users through performance-based marketing, social media, email, and events. Promotional discounts and incentives represent incentives solely to end buyers and, therefore, are not considered payments made to the Company’s customers. Buyers are not customers because access to the 1stDibs online marketplace is free for buyers and the Company has no performance obligations with respect to buyers.
Technology Development	Technology development expenses include payroll, employee benefits, stock-based compensation, and other headcount-related expenses associated with engineering and product development personnel and consulting costs related to technology development. The Company expenses all technology development expenses as incurred. Expenses that meet the criteria for capitalization as internal-use software are capitalized to property and equipment, net on the consolidated balance sheets and amortized over their useful life. This amortization expense related to internal-use software is included in cost of revenue in the consolidated statements of operations.
General and Administrative	General and administrative expenses include payroll, employee benefits, stock-based compensation, other headcount-related expenses associated with finance, legal, facility and human resources related personnel, lease expense, net of sublease income, business liability insurance, accounting, professional fees, and depreciation and amortization of property and equipment. The Company expenses all general and administrative expenses as incurred.
Provision for Transaction Losses	Provision for transaction losses consists primarily of losses resulting from the Company’s buyer protection program, including damages to products caused by shipping and transit, items that were not received or not as represented by the seller, and reimbursements to buyers at the Company’s discretion if they are dissatisfied with their experience. The provision for transaction losses also includes bad debt expense associated with the Company’s accounts receivable.
Stock-Based Compensation	The Company measures all stock-based awards granted to employees, directors, and non-employees based on the fair value on the date of the grant and recognizes compensation expense for those awards over the requisite service period, which is generally the vesting period of the respective award, and recognizes forfeitures as they occur. The fair value of restricted stock units is estimated on the date of grant based on the fair value of the Company’s common stock. The fair value of each stock option is estimated on the date of grant using the Black-Scholes option-pricing model, which requires inputs based on certain subjective assumptions, including the fair value of the Company’s common stock, expected stock price volatility, the expected term of the award, the risk-free interest rate for a period that approximates the expected term of the option, and the Company’s expected dividend yield. Expected volatility was calculated based on the implied volatilities from market comparisons of certain publicly traded companies and other factors. The expected option term was calculated based on the simplified method based on options that had been granted to date, which uses the midpoint between the vesting date and the contractual term, as the Company has not had sufficient historical data to develop an estimate based on participant behavior. The risk-free interest rate was based on the U.S. Treasury bond yield with an equivalent term. The Company has not paid dividends and has no foreseeable plans to pay dividends. The Company classifies stock-based compensation expense in its consolidated statements of operations in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified.
Recent Accounting Pronouncements	Recent Accounting Pronouncements From time to time, new accounting pronouncements are issued by the FASB under its ASC or other standard setting bodies. The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date that it (i) is no longer an emerging growth company or (ii) affirmatively and irrevocably opts out of the extended transition period provided in the JOBS Act. As a result, these financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates. Recently Adopted Accounting Pronouncements In June 2016, the FASB issued Accounting Standards Update (“ASU”) ASU 2016-13, Financial Instruments - Credit Losses, which replaces the incurred loss impairment methodology with a methodology that requires the reflection of expected credit losses and also requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. It also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. For most financial instruments, the standard requires the use of a forward-looking expected loss model rather than the incurred loss model for recognizing credit losses, which generally results in the earlier recognition of credit losses on financial instruments. The Company adopted this standard effective January 1, 2023 under a modified retrospective basis and considers forward-looking information to estimate expected credit losses. No adjustment to accumulated deficit was recorded as the adoption of this standard did not have a material impact on the Company’s consolidated financial statements. Recently Issued Accounting Pronouncements Not Yet Adopted In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which aims to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. The standard will require all public entities, including those with a single reportable segment, to disclose significant segment expenses and other segment items on an annual and interim basis. The guidance requires a public entity to disclose the significant expense categories and amounts that are regularly provided to the chief operating decision-maker. This standard is effective for annual periods beginning January 1, 2024, and for interim periods beginning January 1, 2025, with early adoption permitted. The Company is currently evaluating the potential impact of adopting this new guidance on its consolidated financial statements and related disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which modifies the rules on income tax disclosures. The standard will require entities to disclose (1) specific categories in the rate reconciliation, (2) the income or loss from continuing operations before income tax expense or benefit (separated between domestic and foreign) and (3) income tax expense or benefit from continuing operations (separated by federal, state and foreign). ASU 2023-09 also requires entities to disclose their income tax payments to international, federal, state and local jurisdictions, among other changes. The new standard is effective for annual periods beginning after December 15, 2024. The Company is currently evaluating the potential impact of adopting this new guidance on its consolidated financial statements and related disclosures.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
Summary of Significant Accounting Policies (Tables)	Dec. 31, 2023
Accounting Policies [Abstract]
Cash and cash equivalents	The following represents the Company’s cash, cash equivalents, and restricted cash as of the periods presented: December 31, (in thousands) 2023 2022 2021 Cash and cash equivalents $ 37,395 $ 153,209 $ 168,226 Restricted cash, current — 1,500 — Restricted cash, non-current 3,580 3,334 3,333 Total cash, cash equivalents and restricted cash $ 40,975 $ 158,043 $ 171,559
Restricted cash	The following represents the Company’s cash, cash equivalents, and restricted cash as of the periods presented: December 31, (in thousands) 2023 2022 2021 Cash and cash equivalents $ 37,395 $ 153,209 $ 168,226 Restricted cash, current — 1,500 — Restricted cash, non-current 3,580 3,334 3,333 Total cash, cash equivalents and restricted cash $ 40,975 $ 158,043 $ 171,559
Property and equipment, net	The general range of useful lives of property and equipment is as follows: Estimated Useful Life Leasehold improvements Lesser of lease term or life of asset Furniture and fixtures 3 years Computer equipment and software 3 years Internal-use software Lesser of contract term or 3 years As of December 31, 2023 and 2022, property and equipment, net consisted of the following: December 31, (in thousands) 2023 2022 Internal-use software $ 19,541 $ 18,418 Leasehold improvements 3,605 3,594 Furniture and fixtures 1,131 1,114 Computer equipment and software 919 851 Software in progress 569 562 Total property and equipment, gross $ 25,765 $ 24,539 Less: accumulated depreciation and amortization (22,381) (20,854) Total property and equipment, net $ 3,384 $ 3,685
Fair value measurements, recurring and nonrecurring	The table below segregates all assets that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date: December 31, 2023 (in thousands) Level 1 Level 2 Level 3 Total Cash equivalents: Money market fund $ 5,797 $ — $ — $ 5,797 U.S. Treasury securities — 4,991 — 4,991 Total cash equivalents $ 5,797 $ 4,991 $ — $ 10,788 Short-term investments: Commercial paper $ — $ 18,112 $ — $ 18,112 Corporate notes — 7,641 — 7,641 U.S. Treasury securities — 11,971 — 11,971 U.S. Government agency securities — 64,202 — 64,202 Total short-term investments $ — $ 101,926 $ — $ 101,926
Restructuring charges	The following table displays a rollforward of the charges to the accrued balance as of December 31, 2023: (in thousands) Restructuring Charges Balance, December 31, 2021 $ — Restructuring charges 660 Cash payments (596) Balance, December 31, 2022 $ 64 Restructuring charges 2,004 Cash payments (1,672) Balance, December 31, 2023 $ 396 The expense is included within the respective financial statement line items on the consolidated statement of operations as shown in the table below for the years ended December 31, 2023, and 2022. There was no expense included in the year ended December 31, 2021. Year Ended December 31, (in thousands) 2023 2022 Cost of revenue $ 135 $ 58 Sales and marketing 789 333 Technology development 1,044 201 General and administrative 36 68 Total $ 2,004 $ 660

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
Revenue Recognition (Tables)	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Net revenue by type of service	The following table summarizes the Company’s net revenue by type of service for the periods presented: Year Ended December 31, (in thousands) 2023 2022 2021 Seller marketplace services $ 83,925 $ 94,333 $ 98,984 Other services 759 2,516 3,747 Total net revenue $ 84,684 $ 96,849 $ 102,731
Rollforward of deferred revenue	The following table provides a rollforward of the deferred revenue amounts as follows: (in thousands) Amount Balance as of December 31, 2021 $ 944 Billings 1,502 Revenue recognized (1,661) Reduction resulting from the sale of Design Manager (602) Balance as of December 31, 2022 $ 183 Billings 40 Net revenue recognized (160) Balance as of December 31, 2023 $ 63

Short-Term Investments (Tables)

Short-Term Investments (Tables)	12 Months Ended
Short-Term Investments (Tables)	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Debt securities, available-for-sale	The following table summarizes the estimated value of the Company’s short-term investments as of December 31, 2023: December 31, 2023 (in thousands) Amortized Cost Unrealized Gain Unrealized Loss Fair Value Commercial paper $ 18,101 $ 14 $ (3) $ 18,112 Corporate notes 7,621 20 — 7,641 U.S. Treasury securities 11,975 2 (6) 11,971 U.S. Government agency securities 64,134 89 (21) 64,202 Total short-term investments $ 101,831 $ 125 $ (30) $ 101,926
Investments classified by contractual maturity date	As of December 31, 2023, the fair value of short-term investments by remaining contractual maturity consisted of the following: (in thousands) Fair Value Remaining maturity date one year or less $ 89,203 Remaining maturity date greater than one year 12,723 Total short-term investments $ 101,926

Accounts Receivable, net (Table

Accounts Receivable, net (Tables)	12 Months Ended
Accounts Receivable, net (Tables)	Dec. 31, 2023
Receivables [Abstract]
Changes in the allowance for doubtful accounts	Changes in the allowance for doubtful accounts for the periods presented were as follows: (in thousands) Amount Balance as of January 1, 2022 $ 29 Provisions charged to operating results 206 Account write-offs (122) Balance as of December 31, 2022 $ 113 Provisions charged to operating results 256 Account write-offs (181) Balance as of December 31, 2023 $ 188

Property and Equipment, net (Ta

Property and Equipment, net (Tables)	12 Months Ended
Property and Equipment, net (Tables)	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property and equipment, net	The general range of useful lives of property and equipment is as follows: Estimated Useful Life Leasehold improvements Lesser of lease term or life of asset Furniture and fixtures 3 years Computer equipment and software 3 years Internal-use software Lesser of contract term or 3 years As of December 31, 2023 and 2022, property and equipment, net consisted of the following: December 31, (in thousands) 2023 2022 Internal-use software $ 19,541 $ 18,418 Leasehold improvements 3,605 3,594 Furniture and fixtures 1,131 1,114 Computer equipment and software 919 851 Software in progress 569 562 Total property and equipment, gross $ 25,765 $ 24,539 Less: accumulated depreciation and amortization (22,381) (20,854) Total property and equipment, net $ 3,384 $ 3,685

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
Goodwill (Tables)	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in carrying balance of goodwill	The changes in the carrying balance of goodwill for the periods presented were as follows (in thousands): (in thousands) Amount Balance as of January 1, 2022 $ 7,202 Reduction resulting from the sale of Design Manager (3,036) Foreign currency translation adjustment (91) Balance as of December 31, 2022 $ 4,075 Foreign currency translation adjustment 41 Balance as of December 31, 2023 $ 4,116

Accrued Expenses (Tables)

Accrued Expenses (Tables)	12 Months Ended
Accrued Expenses (Tables)	Dec. 31, 2023
Payables and Accruals [Abstract]
Accrued expenses	As of December 31, 2023 and 2022, accrued expenses consisted of the following: December 31, (in thousands) 2023 2022 Shipping $ 2,934 $ 3,597 Compensation & benefits 3,164 1,862 Sales & use taxes payable 1,534 1,378 Allowance for transaction losses 1,172 1,327 Payment processor fees 557 970 Allowance for e-commerce returns 401 438 Other 1,121 1,189 Total accrued expenses $ 10,883 $ 10,761

Leases (Tables)

Leases (Tables)	12 Months Ended
Leases (Tables)	Dec. 31, 2023
Leases [Abstract]
Schedule of lease expense	The following table summarizes total lease expense, net for the years ended December 31, 2023 and 2022: December 31, (in thousands) 2023 2022 Operating lease expense $ 3,970 $ 3,988 Short-term lease expense 120 111 Variable lease expense 1,124 1,058 Total lease expense $ 5,214 $ 5,157 Sublease income (912) — Total lease expense, net $ 4,302 $ 5,157
Schedule of purchase obligation commitments	As of December 31, 2023, the total remaining operating lease payments included in the measurement of lease liabilities, and undiscounted remaining cash receipts from the Company’s Sublease was as follows (in thousands): Fiscal Year Ending December 31, Operating Lease Payments Sublease Cash Receipts 2024 $ (4,255) $ 2,374 2025 (4,410) 3,435 2026 (4,292) 3,504 2027 (4,292) 3,574 2028 (4,292) 3,645 Thereafter (4,292) 3,718 Total (payments) cash receipts $ (25,833) $ 20,250 Less: imputed interest 3,914 Total lease liabilities $ (21,919) Fiscal Year Ending December 31, Lease Obligations Other Obligations Total Obligations 2024 $ 4,659 $ 1,784 $ 6,443 2025 5,381 922 6,303 2026 5,263 376 5,639 2027 5,263 98 5,361 2028 5,263 14 5,277 Thereafter 4,292 — 4,292 Total $ 30,121 $ 3,194 $ 33,315

Other Current Liabilities (Tabl

Other Current Liabilities (Tables)	12 Months Ended
Other Current Liabilities (Tables)	Dec. 31, 2023
Other Liabilities Disclosure [Abstract]
Other current liabilities	As of December 31, 2023 and 2022, other current liabilities consisted of the following: December 31, (in thousands) 2023 2022 Sales and other non-income tax contingencies $ 2,462 $ 1,863 Buyer deposits 377 318 Other 779 $ 248 Total other current liabilities $ 3,618 $ 2,429

Equity (Tables)

Equity (Tables)	12 Months Ended
Equity (Tables)	Dec. 31, 2023
Equity [Abstract]
Reserved shares of common stock	As of December 31, 2023 and 2022, the Company had reserved shares of common stock for issuance in connection with the following: December 31, 2023 2022 Options to purchase common stock 3,831,710 4,034,287 Restricted stock units outstanding 3,400,489 2,807,981 Shares available for future grant under the 2021 Plan 3,119,122 3,151,824 Shares available for future grant under the ESPP 1,572,504 1,179,902 Total 11,923,825 11,173,994

Stock-based Compensation (Table

Stock-based Compensation (Tables)	12 Months Ended
Stock-based Compensation (Tables)	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock option valuation assumptions used	The following table presents, on a weighted-average basis, the assumptions used in the Black Scholes option-pricing model to determine the grant-date fair value for the years ended December 31, 2022 and 2021: Year Ended December 31, 2022 2021 Expected term in years 6.0 6.0 Expected stock price volatility 64.6% 67.5% Risk-free interest rate 2.3% 1.1% Expected dividend yield — —
Stock option activity	The following table summarizes the Company’s stock option activity since December 31, 2022: Number of Weighted- Weighted- Aggregate Outstanding as of December 31, 2022 4,034,287 $ 6.90 6.9 $ 1,625 Granted — — Exercised (89,251) 3.94 Cancelled/Forfeited (113,326) 6.90 Outstanding as of December 31, 2023 3,831,710 $ 6.97 5.8 $ 826 Options exercisable as of December 31, 2023 2,868,616 $ 6.43 5.1 $ 826 Options vested and expected to vest as of December 31, 2023 3,831,710 $ 6.97 5.8 $ 826
Restricted stock units activity	The following table summarizes the activity related to the Company's restricted stock units: Outstanding Restricted Stock Units Weighted- Outstanding as of December 31, 2022 2,807,981 $ 7.85 Granted 3,044,620 3.96 Vested (1,516,530) 6.38 Cancelled/Forfeited (935,582) 6.47 Outstanding as of December 31, 2023 3,400,489 $ 5.40
Classification of stock-based compensation	The following table summarizes the classification of the Company’s stock-based compensation expense in the consolidated statements of operations: Year Ended December 31, (in thousands) 2023 2022 2021 Cost of revenue $ 390 $ 574 $ 81 Sales and marketing 2,899 2,522 559 Technology development 3,609 4,118 707 General and administrative 5,465 4,000 1,492 Total stock-based compensation expense $ 12,363 $ 11,214 $ 2,839

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Net loss before income taxes	Net loss before income taxes for the years ended December 31, 2023, 2022, and 2021 was as follows: Year Ended December 31, (in thousands) 2023 2022 2021 United States $ (22,844) $ (22,651) $ (20,986) Foreign 159 150 44 Total $ (22,685) $ (22,501) $ (20,942)
Income tax (benefit) provision	For the years ended December 31, 2023, 2022, and 2021, the provision for income taxes consisted of the following: Year Ended December 31, (in thousands) 2023 2022 2021 Current U.S. Federal $ — $ — $ — State 14 37 21 Foreign — — — Total current expense $ 14 $ 37 $ 21 Deferred U.S. Federal — — — State — — — Foreign — — — Total deferred expense — — — Total provision for income taxes $ 14 $ 37 $ 21
Reconciliation of U.S federal statutory rate to effective rate	The reconciliation of the U.S. federal statutory rate to the Company’s effective rate is as follows: Year Ended December 31, 2023 2022 2021 Income tax benefit using U.S. federal statutory rate 21.0% 21.0% 21.0% State income taxes, net of federal benefit 4.1 5.0 4.7 Nondeductible expenses (0.7) (0.3) (0.1) Tax law change — — 0.2 Research credits 0.2 0.1 1.0 Sale of Design Manager — (2.2) — Stock-based compensation (3.1) (0.3) 0.4 Change in the valuation allowance (21.2) (23.5) (27.2) Other (0.4) — (0.1) Provision for income taxes (0.1)% (0.2)% (0.1)%
Deferred income tax assets and liabilities, and activity in deferred tax asset valuation allowance	The significant components of the Company’s deferred income tax assets and liabilities at December 31, 2023 and 2022 were comprised of the following: Year Ended December 31, (in thousands) 2023 2022 Deferred tax assets Net operating losses $ 31,710 $ 32,508 Research credits 3,092 3,065 Property and equipment 363 422 Intangible assets and goodwill 1,074 1,293 Capitalized research and development expense 9,630 4,750 Operating lease liabilities 5,541 6,204 Stock-based compensation 2,295 1,716 Other 1,903 1,464 Total deferred tax assets $ 55,608 $ 51,422 Valuation allowance (49,814) (44,951) Net deferred tax assets $ 5,794 $ 6,471 Deferred tax liabilities Capitalized internal-use software (674) (754) Right-of-use assets (4,968) (5,580) Other (152) (137) Total deferred tax liabilities $ (5,794) $ (6,471) Net deferred tax liabilities $ — $ — The activity in the Company’s deferred tax asset valuation allowance for the years ended December 31, 2023 and 2022, was as follows: Year Ended December 31, (in thousands) 2023 2022 Valuation allowance at beginning of year $ 44,951 $ 39,725 Increases recorded to income tax provision 4,887 5,226 Decreases recorded to equity (24) — Valuation allowance at end of year $ 49,814 $ 44,951
Unrecognized tax benefits	A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows: Year Ended December 31, (in thousands) 2023 2022 Gross tax contingencies as of beginning of year $ 1,022 $ 1,016 Increases in gross tax contingencies 9 6 Gross tax contingencies as of end of year $ 1,031 $ 1,022

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	12 Months Ended
Net Loss Per Share (Tables)	Dec. 31, 2023
Earnings Per Share [Abstract]
Computation of basic and diluted net loss per share	The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders for the years ended December 31, 2023, 2022, and 2021: Year Ended December 31, (in thousands, except share and per share amounts) 2023 2022 2021 Numerator: Net loss $ (22,699) $ (22,538) $ (20,963) Accretion of redeemable convertible preferred stock to redemption value — — (7,061) Net loss attributable to common stockholders $ (22,699) $ (22,538) $ (28,024) Denominator: Weighted average common shares outstanding—basic and diluted 39,724,697 38,479,437 26,059,744 Net loss per share attributable to common stockholders—basic and diluted $ (0.57) $ (0.59) $ (1.08)
Antidilutive securities excluded from computation of diluted net loss per share	The Company excluded the following potentially dilutive securities for each period presented: Year Ended December 31, 2023 2022 2021 Options to purchase common stock 3,831,710 4,034,287 3,949,943 Restricted stock units 3,400,489 2,807,981 309,530 Total 7,232,199 6,842,268 4,259,473

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of purchase obligation commitments	As of December 31, 2023, the total remaining operating lease payments included in the measurement of lease liabilities, and undiscounted remaining cash receipts from the Company’s Sublease was as follows (in thousands): Fiscal Year Ending December 31, Operating Lease Payments Sublease Cash Receipts 2024 $ (4,255) $ 2,374 2025 (4,410) 3,435 2026 (4,292) 3,504 2027 (4,292) 3,574 2028 (4,292) 3,645 Thereafter (4,292) 3,718 Total (payments) cash receipts $ (25,833) $ 20,250 Less: imputed interest 3,914 Total lease liabilities $ (21,919) Fiscal Year Ending December 31, Lease Obligations Other Obligations Total Obligations 2024 $ 4,659 $ 1,784 $ 6,443 2025 5,381 922 6,303 2026 5,263 376 5,639 2027 5,263 98 5,361 2028 5,263 14 5,277 Thereafter 4,292 — 4,292 Total $ 30,121 $ 3,194 $ 33,315

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details)				1 Months Ended		7 Months Ended	12 Months Ended
	Jun. 29, 2022 USD ($)	Jun. 14, 2021 USD ($) $ / shares shares	May 25, 2021	Jun. 30, 2023	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) reporting_unit	Dec. 31, 2023 USD ($) segment reporting_unit	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) shares	Aug. 31, 2023 USD ($)
Subsidiary, Sale of Stock [Line Items]
Conversion of convertible preferred stock (in shares) \| shares		19,243,795							19,243,795
Deferred offering costs		$ 5,500,000
Reverse stock split ratio			0.3333
Number of operating segments \| segment							1
Number of reportable segments \| segment							1
Number of reporting units \| reporting_unit						1	1
Payments to acquire available for sale securities							$ 191,093,000	$ 0	$ 0
Accrued interest receivable						$ 0	500,000	0
Available-for-sale, debt securities credit losses							0
Allowance for seller refunds						300,000	200,000	300,000
Impairment of long-lived assets							0	0	0
Goodwill impairment losses							$ 0	0	0
Stock repurchase program, authorized amount										$ 20,000,000
Commission fees percentage, minimum							5%
Commission fees percentage, maximum							50%
Processing fees percentage							3%
Contract costs, amortization period							3 years
Costs to obtain revenue contracts						500,000	$ 500,000	500,000
Capitalized contract cost, current						300,000	300,000	300,000
Capitalized contract cost, noncurrent						200,000	200,000	200,000
Amortization of costs to obtain revenue contracts							326,000	310,000	447,000
Deferred revenue						$ 183,000	63,000	183,000	944,000
Current portion of deferred revenue							100,000
Non-current portion of deferred revenue							100,000
Advertising expenses							11,000,000	16,300,000	$ 21,200,000
Restructuring costs							2,004,000	660,000
Cash payments							1,672,000	$ 596,000
June 2023, workforce reduction plan
Subsidiary, Sale of Stock [Line Items]
Reduction in workforce, percentage				20%
Restructuring costs							2,000,000
Cash payments							1,600,000
Restructuring accrual							400,000
September 2022, workforce reduction plan
Subsidiary, Sale of Stock [Line Items]
Reduction in workforce, percentage					10%
Restructuring costs					$ 700,000
Cash Equivalents
Subsidiary, Sale of Stock [Line Items]
Payments to acquire available for sale securities							43,100,000
Letter of Credit \| Astor Place, New York
Subsidiary, Sale of Stock [Line Items]
Restricted cash, non-current							3,300,000
Letter of Credit \| Park Avenue South, New York
Subsidiary, Sale of Stock [Line Items]
Restricted cash, non-current							$ 200,000
Design Manager
Subsidiary, Sale of Stock [Line Items]
Joint escrow account	$ 1,500,000
IPO
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares sold (in shares) \| shares		6,612,500
Sale of stock, price (in usd per share) \| $ / shares		$ 20
Common stock sold, net proceeds		$ 123,000,000
Underwriters option
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares sold (in shares) \| shares		862,500

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash and cash equivalents	$ 37,395	$ 153,209	$ 168,226
Restricted cash, current	0	1,500	0
Restricted cash, non-current	3,580	3,334	3,333
Total cash, cash equivalents, and restricted cash	$ 40,975	$ 158,043	$ 171,559	$ 58,195

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Property and Equipment, net (Details)	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer equipment and software
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Internal-use software
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Summary of Assets Measured at Fair Value on a Recurring Basis (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	$ 10,788
Total short-term investments	101,926
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	18,112
Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	7,641
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	11,971
U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	64,202
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	5,797
Total short-term investments	0
Level 1 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0
Level 1 \| Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0
Level 1 \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0
Level 1 \| U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	4,991
Total short-term investments	101,926
Level 2 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	18,112
Level 2 \| Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	7,641
Level 2 \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	11,971
Level 2 \| U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	64,202
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	0
Total short-term investments	0
Level 3 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0
Level 3 \| Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0
Level 3 \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0
Level 3 \| U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0
Money market fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	5,797
Money market fund \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	5,797
Money market fund \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	0
Money market fund \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	0
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	4,991
U.S. Treasury securities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	0
U.S. Treasury securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	4,991
U.S. Treasury securities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	$ 0

Summary of Significant Accoun_8

Summary of Significant Accounting Policies- Restructuring Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Beginning balance	$ 64	$ 0
Restructuring charges	2,004	660
Cash payments	(1,672)	(596)
Ending balance	$ 396	$ 64

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Restructuring Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring costs	$ 2,004	$ 660
Cost of revenue
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring costs	135	58
Sales and marketing
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring costs	789	333
Technology development
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring costs	1,044	201
General and administrative
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring costs	$ 36	$ 68

Acquisitions & Disposals - Narr

Acquisitions & Disposals - Narrative (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 29, 2022	May 02, 2019	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Gain on sale			$ 0	$ 9,684	$ 0
Design Manager
Business Acquisition [Line Items]
Percentage sold	100%
Sale price	$ 14,800
Cash proceeds from sale	14,600
Joint escrow account	$ 1,500
Gain on sale				$ 9,700
Franklin Potter Associates, Inc.
Business Acquisition [Line Items]
Percentage acquired		100%
Purchase consideration		$ 4,200

Revenue Recognition - Net Reven

Revenue Recognition - Net Revenue by Type of Service (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total net revenue	$ 84,684	$ 96,849	$ 102,731
Seller marketplace services
Disaggregation of Revenue [Line Items]
Total net revenue	83,925	94,333	98,984
Other services
Disaggregation of Revenue [Line Items]
Total net revenue	$ 759	$ 2,516	$ 3,747

Revenue Recognition - Rollforwa

Revenue Recognition - Rollforward of Deferred Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Change In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 183	$ 944
Billings	40	1,502
Revenue recognized	(160)	(1,661)
Reduction resulting from the sale of Design Manager		(602)
Ending balance	$ 63	$ 183

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue recognized	$ 100
Costs to obtain revenue contracts	500	$ 500
Capitalized contract cost, current	300	300
Capitalized contract cost, noncurrent	200	200
Amortization of costs to obtain revenue contracts	$ 326	$ 310	$ 447

Short-Term Investments - Summar

Short-Term Investments - Summary of Short-term Investments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 101,831
Unrealized Gain	125
Unrealized Loss	(30)
Fair Value	101,926
Commercial paper
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	18,101
Unrealized Gain	14
Unrealized Loss	(3)
Fair Value	18,112
Corporate notes
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	7,621
Unrealized Gain	20
Unrealized Loss	0
Fair Value	7,641
U.S. Treasury securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	11,975
Unrealized Gain	2
Unrealized Loss	(6)
Fair Value	11,971
U.S. Government agency securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	64,134
Unrealized Gain	89
Unrealized Loss	(21)
Fair Value	$ 64,202

Short-Term Investments - Short-

Short-Term Investments - Short-Term Investments Remaining Contractual Maturity (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Investments, Debt and Equity Securities [Abstract]
Remaining maturity date one year or less	$ 89,203
Remaining maturity date greater than one year	12,723
Total short-term investments	$ 101,926

Accounts Receivable, net - Narr

Accounts Receivable, net - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Accounts receivable, net	$ 643	$ 972
Allowance for doubtful accounts	$ 188	$ 113	$ 29

Accounts Receivable, net - Chan

Accounts Receivable, net - Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 113	$ 29
Provisions charged to operating results	256	206
Account write-offs	(181)	(122)
Ending balance	$ 188	$ 113

Property and Equipment, net (De

Property and Equipment, net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 25,765	$ 24,539
Less: accumulated depreciation and amortization	(22,381)	(20,854)
Total property and equipment, net	3,384	3,685
Internal-use software
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	19,541	18,418
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	3,605	3,594
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	1,131	1,114
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	919	851
Software in progress
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 569	$ 562

Property and Equipment, net - N

Property and Equipment, net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Net book value of internal-use software	$ 2.7	$ 3
Depreciation	2.3	2.6	$ 2.9
Amortization expense for internal-use software	$ 2.2	$ 2.5	$ 2.8

Goodwill - Goodwill (Details)

Goodwill - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Goodwill - Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance	$ 4,075	$ 7,202
Reduction resulting from the sale of Design Manager		(3,036)
Foreign currency translation adjustment	41	(91)
Ending balance	$ 4,116	$ 4,075

Accrued Expenses (Details)

Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Shipping	$ 2,934	$ 3,597
Compensation & benefits	3,164	1,862
Sales & use taxes payable	1,534	1,378
Allowance for transaction losses	1,172	1,327
Payment processor fees	557	970
Allowance for e-commerce returns	401	438
Other	1,121	1,189
Total accrued expenses	$ 10,883	$ 10,761

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands		12 Months Ended
Leases - Narrative (Details) $ in Thousands	Apr. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 15, 2024	Nov. 01, 2023 ft²	Oct. 01, 2023	Aug. 01, 2023
Lessor, Lease, Description [Line Items]
Operating lease right-of-use assets		$ 19,655	$ 21,990
Operating lease liabilities, current		3,107	2,770
Operating lease liabilities, non-current		$ 18,812	21,678
Operating lease, weighted average remaining lease term		6 years
Operating lease, weighted average discount rate, percent		5.90%
Operating lease, payments		$ 4,100	4,200
Sublease rentable space, percentage						0.78
Sublease abatement provision term							5 months
Broker fee		1,100
Sublease income		$ 912	$ 0
Lessee, lease not yet commenced, net rentable area \| ft²					13,000
Lessee, lease not yet commenced, term of contract					5 years
Lessee, lease not yet commenced, initial abatement term					7 months
Lessee, lease not yet commenced, renewal term					5 years
Subsequent Event
Lessor, Lease, Description [Line Items]
Sublease rentable space, percentage				1
Sublease monthly rental payments	$ 300

Leases - Schedule of lease expe

Leases - Schedule of lease expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease expense	$ 3,970	$ 3,988
Short-term lease expense	120	111
Variable lease expense	1,124	1,058
Total lease expense	5,214	5,157
Sublease income	(912)	0
Total lease expense, net	$ 4,302	$ 5,157

Leases - Schedule of remaining

Leases - Schedule of remaining operating lease payments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2024	$ (4,255)
2025	(4,410)
2026	(4,292)
2027	(4,292)
2028	(4,292)
Thereafter	(4,292)
Total	(25,833)
Less: imputed interest	3,914
Total lease liabilities	(21,919)
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract]
2024	2,374
2025	3,435
2026	3,504
2027	3,574
2028	3,645
Thereafter	3,718
Total (payments) cash receipts	$ 20,250

Other Current Liabilities (Deta

Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Sales and other non-income tax contingencies	$ 2,462	$ 1,863
Buyer deposits	377	318
Other	779	248
Total other current liabilities	$ 3,618	$ 2,429

Equity - Reserved Shares of Com

Equity - Reserved Shares of Common Stock for Issuance (Details) - shares	Dec. 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Common stock reserved for issuance (in shares)	11,923,825	11,173,994
Stock options
Class of Stock [Line Items]
Common stock reserved for issuance (in shares)	3,831,710	4,034,287
Restricted stock units outstanding
Class of Stock [Line Items]
Common stock reserved for issuance (in shares)	3,400,489	2,807,981
Employee stock purchase plan
Class of Stock [Line Items]
Common stock reserved for issuance (in shares)	1,572,504	1,179,902
2021 Plan
Class of Stock [Line Items]
Common stock reserved for issuance (in shares)	3,119,122	3,151,824

Equity - Narrative (Details)

Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 14, 2021
Equity [Abstract]
Preferred stock, authorized (in shares)	10,000,000	10,000,000	10,000,000
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01	$ 0.01
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, authorized (in shares)	400,000,000	400,000,000
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Treasury stock, common (in shares)	823,483	0
Treasury common stock, value	$ 3.5
Stock repurchase program, remaining authorized repurchase amount	$ 16.5

Stock-based Compensation - Narr

Stock-based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 01, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of stock options exercised		$ 100	$ 1,300	$ 4,800
Weighted-average grant-date fair value of stock options granted (in usd per share)			$ 4.43	$ 6.20
Fair value of stock options vested		$ 3,400	$ 3,500	$ 1,500
Granted (in shares)		0
Total stock-based compensation		$ 12,363	11,214	$ 2,839
Stock-based compensation, capitalized		200	$ 100
Unrecognized compensation expense		21,900
Stock options - performance conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Granted (in shares)				615,997
Stock options - performance conditions \| Vesting tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				21%
Stock options - performance conditions \| Vesting tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				38 months
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		$ 700
Unrecognized compensation expense, weighted-average period for recognition		2 years 2 months 12 days
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in common stock available for future issuance (in shares)	392,602
Maximum shares that may be issued (in shares)		1,572,504
Number of shares available for issuance, annual increase, percentage		1%
Annual increase in number of shares that may be issued, term		10 years
Number of shares available for issuance, annual increase (in shares)		400,000
Maximum percentage of eligible compensation		15%
Purchase price percentage		85%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of restricted stock units granted (in usd per share)		$ 3.96	$ 7.51	$ 15.32
Vested restricted stock units converted to common shares, net of shares net settled for taxes		$ 9,700	$ 6,700	$ 100
RSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
RSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
2011 Plan \| Stock options - new employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period		10 years
Vesting period		4 years
2011 Plan \| Stock options - new employees \| Vesting tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		1 year
Vesting percentage		25%
2011 Plan \| Stock options - new employees \| Vesting tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		36 months
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in common stock available for future issuance (in shares)	1,963,010
Maximum shares that may be issued (in shares)		4,333,333
Maximum shares that may be issued, annual increase, period		10 years
Number of shares available for issuance, annual increase, percentage		5%
Shares available for grant (in shares)		3,119,122
2021 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Vesting percentage		25%

Stock-based Compensation - Valu

Stock-based Compensation - Valuation Assumptions (Details)	12 Months Ended
Stock-based Compensation - Valuation Assumptions (Details)	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Expected term in years	6 years	6 years
Expected stock price volatility	64.60%	67.50%
Risk-free interest rate	2.30%	1.10%
Expected dividend yield	0%	0%

Stock-based Compensation - Stoc

Stock-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of Options
Outstanding (in shares)	4,034,287
Granted (in shares)	0
Exercised (in shares)	(89,251)
Cancelled/Forfeited (in shares)	(113,326)
Outstanding (in shares)	3,831,710	4,034,287
Options exercisable (in shares)	2,868,616
Options vested and expected to vest (in shares)	3,831,710
Weighted- Average Exercise Price
Outstanding (in usd per share)	$ 6.90
Granted (in usd per share)	0
Exercised (in usd per share)	3.94
Cancelled (in usd per share)	6.90
Outstanding (in usd per share)	6.97	$ 6.90
Options exercisable (in usd per share)	6.43
Options vested and expected to vest (in usd per share)	$ 6.97
Weighted- Average Remaining Contractual Term (Years)
Outstanding	5 years 9 months 18 days	6 years 10 months 24 days
Exercisable	5 years 1 month 6 days
Vested and expected to vest	5 years 9 months 18 days
Aggregate Intrinsic Value (in thousands)
Outstanding	$ 826	$ 1,625
Exercisable	826
Vested and expected to vest	$ 826

Stock-based Compensation - Rest

Stock-based Compensation - Restricted Stock Units Activity (Details) - Restricted stock units - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Outstanding Restricted Stock Units
Outstanding (in shares)	2,807,981
Granted (in shares)	3,044,620
Vested (in shares)	(1,516,530)
Cancelled/Forfeited (in shares)	(935,582)
Outstanding (in shares)	3,400,489	2,807,981
Weighted- Average Grant Date Fair Value
Outstanding (in usd per share)	$ 7.85
Granted (in usd per share)	3.96	$ 7.51	$ 15.32
Vested (in usd per share)	6.38
Cancelled/Forfeited (in usd per share)	6.47
Outstanding (in usd per share)	$ 5.40	$ 7.85

Stock-based Compensation - Clas

Stock-based Compensation - Classification of Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 12,363	$ 11,214	$ 2,839
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	390	574	81
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	2,899	2,522	559
Technology development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	3,609	4,118	707
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 5,465	$ 4,000	$ 1,492

Income Taxes - Net Loss Before

Income Taxes - Net Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
United States	$ (22,844)	$ (22,651)	$ (20,986)
Foreign	159	150	44
Net loss before income taxes	$ (22,685)	$ (22,501)	$ (20,942)

Income Taxes - Income Tax (Bene

Income Taxes - Income Tax (Benefit) Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
U.S. Federal	$ 0	$ 0	$ 0
State	14	37	21
Foreign	0	0	0
Total current expense	14	37	21
Deferred
U.S. Federal	0	0	0
State	0	0	0
Foreign	0	0	0
Total deferred expense	0	0	0
Total provision for income taxes	$ 14	$ 37	$ 21

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Effective Rate (Details)	12 Months Ended
Income Taxes - Reconciliation of Effective Rate (Details)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income tax benefit using U.S. federal statutory rate	21%	21%	21%
State income taxes, net of federal benefit	4.10%	5%	4.70%
Nondeductible expenses	(0.70%)	(0.30%)	(0.10%)
Tax law change	0%	0%	0.20%
Research credits	0.20%	0.10%	1%
Sale of Design Manager	0%	(2.20%)	0%
Stock-based compensation	(3.10%)	(0.30%)	0.40%
Change in the valuation allowance	(21.20%)	(23.50%)	(27.20%)
Other	(0.40%)	0%	(0.10%)
Provision for income taxes	(0.10%)	(0.20%)	(0.10%)

Income Taxes - Deferred Income

Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets
Net operating losses	$ 31,710	$ 32,508
Research credits	3,092	3,065
Property and equipment	363	422
Intangible assets and goodwill	1,074	1,293
Capitalized research and development expense	9,630	4,750
Operating lease liabilities	5,541	6,204
Stock-based compensation	2,295	1,716
Other	1,903	1,464
Total deferred tax assets	55,608	51,422
Valuation allowance	(49,814)	(44,951)	$ (39,725)
Net deferred tax assets	5,794	6,471
Deferred tax liabilities
Capitalized internal-use software	(674)	(754)
Right-of-use assets	(4,968)	(5,580)
Other	(152)	(137)
Total deferred tax liabilities	(5,794)	(6,471)
Net deferred tax liabilities	$ 0	$ 0

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Increase in deferred tax assets valuation allowance	$ 4,900	$ 5,200
Operating Loss Carryforwards [Line Items]
Increase in deferred tax assets valuation allowance	4,900	5,200
NOL, not subject to expiration	60,200
Uncertain tax positions	1,031	$ 1,022	$ 1,016
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	112,800
NOL, subject to expiration	52,600
Tax credit carryforwards	4,100
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	119,200
NOL, subject to expiration	80,000
Tax credit carryforwards	100
NOL, some subject to expiration and some not subject to expiration	$ 39,200

Income Taxes - Activity in Defe

Income Taxes - Activity in Deferred Tax Asset Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Valuation allowance at beginning of year	$ 44,951	$ 39,725
Increases recorded to income tax provision	4,887	5,226
Decreases recorded to equity	(24)	0
Valuation allowance at end of year	$ 49,814	$ 44,951

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]
Gross tax contingencies as of beginning of year	$ 1,022	$ 1,016
Increases in gross tax contingencies	9	6
Gross tax contingencies as of end of year	$ 1,031	$ 1,022

Net Loss Per Share - Computatio

Net Loss Per Share - Computation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net loss	$ (22,699)	$ (22,538)	$ (20,963)
Accretion of redeemable convertible preferred stock to redemption value	0	0	(7,061)
Net loss attributable to common stockholders, basic	(22,699)	(22,538)	(28,024)
Net loss attributable to common stockholders, diluted	$ (22,699)	$ (22,538)	$ (28,024)
Denominator:
Weighted average common shares outstanding—basic (in shares)	39,724,697	38,479,437	26,059,744
Weighted average common shares outstanding—diluted (in shares)	39,724,697	38,479,437	26,059,744
Net loss per share attributable to common stockholders—basic (in usd per share)	$ (0.57)	$ (0.59)	$ (1.08)
Net loss per share attributable to common stockholders—diluted (in usd per share)	$ (0.57)	$ (0.59)	$ (1.08)

Net Loss Per Share - Antidiluti

Net Loss Per Share - Antidilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	7,232,199	6,842,268	4,259,473
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	3,831,710	4,034,287	3,949,943
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	3,400,489	2,807,981	309,530

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Contractual obligation	$ 33,315
Sales and other non-income taxes	$ 2,500	$ 1,900

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Purchase Obligation Commitments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Lease Obligations
2024	$ 4,659
2025	5,381
2026	5,263
2027	5,263
2028	5,263
Thereafter	4,292
Total	30,121
Other Obligations
2024	1,784
2025	922
2026	376
2027	98
2028	14
Thereafter	0
Total	3,194
Total Obligations
2024	6,443
2025	6,303
2026	5,639
2027	5,361
2028	5,277
Thereafter	4,292
Total	$ 33,315